What head gasket for boost? MLS leaking oil

You can use the Wallace Dynamic compression calculator: Wallace Racing: Dynamic Compression Ratio Calculator

You'll need to first separately compute the static CR with either the Wallace CR calculator or the Pat Kelley calculator (my preference).

I ran it on my estimates of your engine parameters and got 12.9, and get 13.0 for my Starion turbo engine. I was not sure which cam to use for which of your engines, so used the 62 intake closing angle for the Comp cam listed earlier. Somewhere around 13 is the upper end of the recommended range for pressurized engines; but differences in engines will modify that limit. There is an assumed fill efficiency in the engine intake, valves, cam, etc., that goes with that 13 limit number, and one other thing that occurs to me is that with the big lift cam that you have, the fill efficiency in your setup may be higher than for most turbo cams which don't have such big lifts. Ditto for the heads that you have; they flow well and will increase the fill .So that may effectively push your real number past 13.

And you mention intercooler; my Starion does run one; my pressure numbers are after the intercooler. That engine has all the advantages that I mentioned before. Of course, an intercooler is going to INCREASE the air density to the intake along with the reduced temps, so that tends to increase the cylinder pressures.

BTW, I looked it up; your 98 octane is the equivalent of our 93 octane. As an FYI, some research back in the 80's indicated that the atmospheric humidity on a humid day can be worth the equivalent of up to 3-4 points extra in octane; that is the point of mentioning a dry cool day as a possible contributor for your situation.