Pistons and cam selection for 383 with rpm heads

There are not many options for pistons. So honestly the best way is to have the block milled to get those KB400s to zero deck. I'm not a fan of domed pistons but there's not much you can do. You can get 10:1 easy with 400s at zero and a .039 Fel Pro Performance gasket. If you hit 10:1 true a cam like the Comp XE275HL will make 400hp easy.