360 Cylinder Pressures

May I chuck in my two bobs worth. I have just complete my first Mopar small block build in 40 years a qualified mechanic. My 360 had standard low comp dished top pistons .125" down the bore - that is 1/8"! That plus open chamber heads is why you have no compression to speak of. I have now installed KB190 pistons that have a small dome and a higher pin position and with .027" copper gaskets I have 165 PSI cranking dry. This is with a meaty ST 21 Racer Brown solid camshaft.
Cheers