383 piston choice

Static compression has little or nothing to do with running pump fuel. I've done it with up to 185psi. that engine was a 383 with stock replacement pistons and the stock RR cam. What you will fail to find is many "10:1" pitsons or engines that actually exist. Because the blocks are so tall naturally none of the pistons' advertised ratios are close to reality like JohnRR has said. In any event, running the 284/.484 there wont be any cylinder pressure to worry about...lol.