Cam swap without pulling motor

Getting down to choosing a head gasket and measuring for pushrods. Here's some specs: cast iron heads milled down 0.078" with nail head valves measure out to 53cc chamber. With piston 0.106" in the hole, a 9.1cc dish and 256/265 cam with an intake closing of 56 ABDC I get the following static and dynamic compression ratios:

Felpro 0.051" gasket: Static-8.88, Dynamic-7.54
Felpro 0.039" gasket: Static-9.1, Dynamic-7.72
Cometic 0.027" gasket: Static-9.32, Dynamic-7.9

3600lb truck with 727 transmission, factory 2500 stall, 3.55 gears to be a street driver.

I'm inclined to go with the Cometic gasket. Is that pushing the limit on CR with these non quench heads and pump gas?