hope you don't have to much trouble with the inlet manifold , the air cleaner backing plate should be free standing with no load when bolted up , no stress on the inlet manifold , with the heads instead of buying new dome pistons , you could weld up the squish shelf on each side & reshape & c.c. to 11.2 - 4 c.ratio , check valve to piston clearance & shave heads to suit for your comp modification , dome pistons would raise comp with no squish there would be room for the slight jump