Hi Tom as I have not seen you here in a bit. Tom I use the 440Source 4.15 stroker kit with dished pistons as I use the basic EZ heads and with the D-dish pistons I have 10.6 comp for pump friendly 92. I do have .045 quench also and a custom solid flat tappet to keep the cyl pressure down enough for pump gas. I drive it on the street 99% of the time and I use the Indy dual plane with an 850 DP as the driveabilty is very good. I am sure the Stealth heads would work about as good with porting as my EZ's are just cleaned up and not seriously ported. Ron