Yes the drive can be replaced and can be the cause of your problem. Might not be something your local auto parts store has in stock but most vintage Chevy parts specialists ought to have one. It is referred to as either a Starter Drive, Bendix Drive, or occaisionally a starter drive clutch. Modern day Chevy starter drives are around $30 to $35 at the parts stores. "Your 235's drive price may vary"
Mike
