Ask Clint Eastwood to select personal favorites among his movies and one choice might surprise you. "It's an old-fashioned theme," Eastwood says. "But if, as a film director, I ever wanted to say something, you'll find it in Bronco Billy.""One of the funniest and most touching films you'll see this or any year" (Rona Barrett, ABC-TV) casts him as the ace sharpshooter and head of Bronco Billy's Wild West Show, a down-at-the-heel traveling circus. Life's been hard for Billy and his ragtag troupe. But their luck might change - in the unlikely person of a highfalutin society dame (Sondra Locke). You may already have a favorite Eastwood role. Watch Bronco Billy and chances are you'll have another.