The Indianapolis Colts, moving up two spots in the April 29 NFL draft to the fourth pick overall, traded first-round draft choices yesterday with the New Orleans Saints, a Colts spokesman said.

The Colts had the sixth pick in the first round and the Saints the fourth pick before the trade. The Colts also gave the Saints their third-round draft choice, the 60th selection overall, said Bob Eller.

The St. Louis Cardinals have the fifth pick in the first round.

Asked why the Colts made a trade to advance just two places in the drafting order, Eller said: "Obviously, it was to move up in the first round."

The Colts have not indicated whom they want to draft in the first round, but speculation has centered around quarterbacks Jim Everett of Purdue and Chuck Long of Iowa.

The Colts, who went 5-11 in 1985, are also believed to be interested in running back Keith Byars of Ohio State, who missed most of the 1985 season with a broken foot after rushing for 1,655 yards in 1984.

Byars, who had foot surgery in January, is scheduled to receive a physical examination by the Pittsburgh Steelers today . . .

Art Schlichter, in Tampa, Fla., for a tryout with the U.S. Football League's Tampa Bay Bandits, said he is confident he'll play for an NFL team next season but isn't ruling out the USFL. The former Colts quarterback worked closely with Bandits Coach Steve Spurrier for 1 1/2 hours.

"I'm looking for a place where I can learn and be under somebody who is willing to work with me and give me the opportunity to improve," said Schlichter, 25. He said he has set a deadline of April 29 -- the day of the NFL draft -- to sign with a team.