On my 440/493 street eng I am using the basic EZ heads and I use a dished piston to have a 10.6 comp ratio. I run about .046 quench and it runs fine on 91 to 93 pump with 36 total timing all in about 1800 rpm. I use the felpro .039 gaskets and my piston flats are about .006 to .007 down in the cyl. You are running more comp then me but I have had no eng ping at all as I run a full exh and would hear it if it had any ping or spark knock. My cam is 264 & 270 @ .050 with .585 & .592 lift. And if its a street eng you plan to put alot of miles on as I do I would feel better at the .045 quench. Ron