Two Channel 7 veterans have signed new three-year contracts, the station announced yesterday . . .

Renewed were Jim Clarke, who's in his 23rd year with the station, and finance reporter John Spiropoulos, who's been at Seven for 11 years . . .

"The Wildest West Show of the Stars" special on CBS Tuesday night barely got out of the Nielsen corral, lassoing a lil ole 11.8 national rating and a 20 percent audience share (whoa, there, Airwaves) . . .

ABC News has named Sally Holm as senior producer of "ABC World News Tonight With Peter Jennings." She replaces Jim Bellows, who is leaving the network . . .

Since September l983, Holm has been producer of Richard Threlkeld's "Status Reports" for "WNT" . . .

Bellows, a former editor of The Washington Star, came to ABC News three years ago from "Entertainment Tonight" to develop new programs. His top project, "Seven Days," never got beyond the pilot stage. He said yesterday that his future plans are indefinite . . .

What a difference a day makes (24 little hours)! The crew of "West 57th" went to sleep Tuesday night stuck in the 8 p.m. Wednesday time slot (which earned them a season-low 7.2 rating last week) . . . but when they woke up yesterday there they were in the 10 p.m. Wednesday time slot right after "Dallas" starting June 11!!! . . .

That should make the last seven weeks of the magazine's 13-week run a lot more fun . . .

The change was included in the Summer Schedule announced yesterday by the network that affects every night except Sunday and Monday, starting the week of June 9 . . .

The new Tuesday lineup has "Simon & Simon" at 8; "Magnum P.I." at 9; and "The Equalizer" at 10 . . .

On Wednesday: "Foley Square" at 8; "Charlie & Co." at 8:30; "Dallas" at 9; and "West 57th" at 10 . . .

On Thursday: "Crazy Like a Fox" at 8; "Trapper John, M.D." at 9; and "Knots Landing" at 10 . . .

On Friday: "The Twilight Zone" at 8; and the CBS Friday Night Movies at 9 . . .

On Saturday: "Airwolf" at 8; and the CBS Saturday Night Movies at 9 . . .

The reasoning behind the CBS moves remained inscrutable to Captain Airwaves yesterday although he divined that with Sunday already accounted for, the network will now have three straight nights of movies!!! . . .

NBC Entertainment also announced some schedule changes for the summer yesterday but in most cases, the rationale is clear . . .

For instance, starting Monday, June 30, "Amazing Stories" goes to 8:30 . . . which will be its regular time slot in the fall . . .

On June 21, "The Facts of Life" at 8 and "227" at 8:30 move into their regular fall time slots . . .

And on Wednesday, June 18, "Gimme a Break" at 9 and "You Again?" at 9:30 will be seen in their new fall time periods . . .

NBC also announced that "Valerie," which will be seen at 8:30 Sundays in the fall, moves to Monday at 8 starting June 30 . . .

The network also announced a limited run for a new situation comedy called "Me and Mrs. C," which will air in the 9:30 p.m. Saturday slot starting June 21 . . .

It stars Peg Murray as a 62-year-old white widow who takes in a 22-year-old unemployed black college graduate and ex-convict as a boarder "because she wants to remain financially independent of her meek son and his insufferable wife" (this one touches all the bases) . . .

Misha McK plays the 22-year-old . . . Also in the News

"CBS Evening News With Dan Rather" won the network news race for the week ending May 23 with a 10.9 Nielsen rating and a 22 percent audience share. "ABC World News Tonight With Peter Jennings" was second with 10.3/21, while "NBC Nightly News With Tom Brokaw" plunged to third with a 10.1/21 . . .

By the by, ABC anchor Peter Jennings tried, without success, to join tonight's "Viewpoint" cast in its broadcast from Nashville . . . reportedly after it was announced that NBC News anchor Tom Brokaw, among others, was to appear on the panel . . .

"I told them I'd like to be on the broadcast," Jennings said yesterday, "but it's not my broadcast to control. I have an interest in panel topics Chernobyl and terrorism and I'd like to participate" . . .

He said that ABC was "probably obligated to have Tom on the broadcast" in view of NBC's recent controversial interview with fugitive Arab terrorist Mohammed Abu Abbas . . .

"I told both [ABC News Executive Vice President] David Burke and [ABC News President] Roone Arledge I'd like to be on it and that it would be a useful exercise. But it might have been a little crowded. I'm not profoundly offended that I won't be on it" . . .

The Associated Press and Conus Communications yesterday announced formation of a joint venture to produce a TV news feed service of Washington events and video-formatted AP news photos . . .

The "video news service," to be called TV Direct, is scheduled to be in full operation by August . . .

More than 600 TV stations around the country are now capable of receiving TV Direct . . .

Conus is part of the Hubbard Broadcasting empire. AP is "the world's largest and oldest news gathering organization" and serves nearly 6,000 broadcast stations in the United States . . .

A conference on "Sexual Imagery on Television" will be held today at the Marvin Center at 21st and H streets NW starting at 9:30 a.m. . . .

Cosponsored by the Washington chapter of Planned Parenthood and the George Washington University Department of Communications and Theater, the meeting will be open to the public . . .

Panelists include WDVM news anchor Maureen Bunyan; Douglas Gould, vice president of communications for the Planned Parenthood Federation of America; GWU professor Mark Tolsted; independent TV director Murray Golden; and Marsha Renwanz, staff director of the Senate Childrens Caucus . . . TV Ratingzzzz

NBC coasted to an easy win last week "On Wings of Eagles" and Perry Mason's very wide coattails, cinching the May ratings sweeps crown in the bargain . . .

With the usual help from "The Cosby Show" and "Family Ties," NBC had a 15.5 rating average and a 28 percent share of the audience for the week ending May 25, compared with a 12.2/22 for ABC and an 11.5/21 for CBS . . .

Perry's "Case of the Notorious Nun" Sunday didn't do as well as his "Perry Mason Returns" last December (when it led the weekly ratings with a 27.2/39) but considering he showed up on a warm early summer holiday weekend this time, Perry's periodic pulling power is awesome . . .

Skipping down the thin line of petitioners waiting outside the Primetime Pantheon this morning, we noticed CBS' Neil Diamond special in a tie for 21st, the ABC movie "Johnny Bull" in 29th and CBS' "Blood Sport" in 38th . . .

CBS' Flintstone 25th anniversary special tied with its "Samaritan: The Mitch Snyder Story" for 39th (the latter with a skimpy 11.2 rating and an 18 share), the NBC Disney summer vacation special was 44th, Part I of "The Right Stuff" on ABC was 47th, and CBS' "All The Right Moves" was 51st . . .

CBS' "Teenage America: The Glory Years" special was 55th . . .

The Final And All Too Often Fatal Five Plus One last week was led by CBS' "Airwolf" and the ABC movie, "Long Time Gone," which tied for 57th. They were followed, in order, by CBS' "West 57th," in 59th; NBC's "Silver Spoons"; ABC's "Benson"; and ABC's "Mr. Sunshine.