Cam selection help

My calculations on compression with stealth heads with 80 cc chambers +7 cc pistons 4.35 bore 3.75 stroke and felpro. 039 head gasket puts me at 10.46 to 1 compression. What compression can I go to to still use pump gas? I was told 10.5?

Were did you come up with +7 cc on the 2266s?