I bet it runs really well with high octane fuel.

I don't think an addirional .040" in head gasket thickness will be enough, IMO.

I'm at 1,000 ft., have 10.8:1 CR, it blows 195 psi on the gauge, have quench, a much lated intake closing point that you, run 93 octane, and I'm on the edge of detonation. It will ping with some winter grade 93 octane.

On another motor, I've played with fuel, timing, plugs, temperature, to eliminat detonation, and if you are close to beging with, you might be abe to get there. You're not close, IMO.

Good luck