Best piston for street/strip 340?

I prefer forged piston engines to be loose anyway. A little rattle never bothers me. At least I know they ain't gonna seize up. The old TRWs (and I assume the Speed Pros as well) were "cam ground" pistons. In other words, they were not round at room temperature. Once they get to operating temperature, they expand to the proper size. That's why the old school forged pistons would sound like a diesel when cold, but quieten down when warm.