Piston choice for Edelbrock Heads?

I run the KB745s in my car, Edelbrock heads, with a 4" stroke and a .039" head gasket and I have a static ratio of 10.3:1. Keep in mind the 63 CC heads typically measure out around 64-65 CCs. Since my heads were ported by Shady Dell I had him mill the heads down to 62 CCs. I run 93 pump gas but I would bet lower octane fuel would run fine. If I were you being in CA and you want to run pump gas I'd just run the 745s with the heads uncut, .039" gasket, and you will be able to run on low octane fuel no problem.

I would have a good shop like Indio Motor Machine check those heads over before you run them too. Have the valve job cleaned up, surface trued, valve guide clearance checked/corrected, and a littlle bowl blending would go a long way. And make sure the valve springs are correctly matched to the cam you run.