David Overstreet, Miami's No. 1 pick in the 1981 NFL draft, has signed with the Dolphins after two years in Canada, following the lead of fellow former Oklahoma Sooner Keith Gary, Pittsburgh's No. 1 pick in '81 who left CFL to sign with the Steelers on the weekend. DE Gary, onetime Chantilly High athlete, took a multiyear deal; RB Overstreet a three-year pact. Miami made a qualifying offer to retain right of first refusal on Overstreet; lands him after he tested the free-agent market. Now if he can just hang onto the ball. Old OU wishbone habits hard to break, Overstreet fumbled 17 times in 1981 with Montreal; after three games last CFL season, went on injured reserve--though healthy . . .

Bob Morgan, who "saw what happened on TV last week and called the coach," is trying out to place-kick for the Federals; at Mississippi State, he kicked extra points while Dana Moore, the Federals' current punter, did field goals. Another candidate: Steve Sinclair of West Virginia. Ken Olson isn't gone yet, though--but safety Donnie Harris, a starter until last game, and linebacker Bob Shupyrt are; waived . . .

Bill Simpson, 31, the ball-hawking NFL safety who retired from the Rams only to unretire as a Buffalo Bill under his old L.A. coach, Chuck Knox: retired again, after eight pro years with 34 interceptions, nine in playoffs. Or will Simpson show up someday in Seattle, now that Knox is there?