magnum heads, 10.6 to 1 and a mild cam?

I built my J head 340 to 8.2 dynamic and it runs great on 93. Knocked down all edges on pistons, smoothed combustion chambers and got all chambers the same CCs, 34* total timing. Pick another cam with a later IVC point and get the dynamic down. I hope you are CCing everything yourself. Piston specs from the manufacturer usually are not correct due to deck height variables.