High compression with aluminum heads and pump gas???????

As far as gasket thickness, have you worked over your piston deck height vs the head to see if the quench gap is around .040"? That is a pretty well established aid to avoiding detonation, and IMHO you would do well to strive for that, regardless of a few tenths difference in SCR. Look at your computed DCR with the chosen cam to see if it is in the 8 to 8.5 range tops. Just don't put in a super-short overlap/duration turbo cam in it and the DCR's ought to end up in that range; there are plenty of DCR calculators out there online.

Personal opinion: My son and I are readying a build with the same AL heads, static CR, and a DCR in the low to mid 8 range, and I am not too worried about it on 93 octane, even with a low duration, torque cam. I ran a similar quench chamber/low duration combo a few decades ago and never had issue on low lead high test. It would occasionally ping and rattle on regular. (Auto trans, stock torque converter). Keep your revs up a bit on the manual trans (i.e., don't lug it), and IMHO, it should be OK.

Just a caution: that is not a guarantee, just an opinion and probability based on generally known engine build info and experiences. That is all anyone can give to you. At some point, you have to draw your own good or bad conclusions, tempered with others' advice and experiences and your own calculations, and go forward with it.