Correct pistons for rpm heads 360?

With an uncut deck, the comp height of the KB190 piston will be around .012" below the deck. The .050" dome will stick out around .038". So you would need a .075" or so thick head gasket to provide a .037" nominal quench gap with the closed chamber Edelbrocks. SCR would be just over 10:1 at that point. NG

Are you using the 63 closed chamber or the 65 cc 'open' chamber Edelbrocks? If using the 65 cc 'open' ones, then the KB190's should work out fairly close with an .028" thick head gasket. The .038" protrusion of the domes out of the block would end up protruding approx .010" above the head gasket and leave you with a .050" quench distance, and an SCR of around 11.3 SCR. You could mill .010" off the heads to get that down to .040"; SCR would go up to around 11.5 then.

Your quench gap would not be perfect with the KB190's as the lowered edge of the dome would leave a small sliver of much larger quench gap around the periphery; so some of the quench 'squirt action' would go there rather than out into the main chamber. I can't say if or how much that might be detrimental to quench benefits.