Mild 383 build

I was concerned about that too!!!!!!! So I contacted Don Garlit's drag racing museum and got a reply from Chuck Garlits. His reply was that they've bored them as far as .125" with no heating issues.
I would like to try the 440 piston in a 383. Especially at close to .125 over. That piston size is readily available. That would definitely unshroud the valves in aluminum heads. So then I guess that a 400 build would be a better choice with .030 over bore. Kim