Yepper, there's a lot to the topic. Realize that although the factory rated them at 10.75:1 they weren't really that high in practice. That figure was based on a 'factory blueprint' combustion chamber cc size in the mid 60's and a block that had been zero-decked. Actual chamber size on "most" Pontiac iron heads of the era will be around 72 and pistons are usually around .020 down at TDC. To find out where you're really at, compression wise, you need to actually measure both your chamber sizes and your deck clearance.
It's very possible to get off the shelf pistons that will put your actual compression ratio where it "needs to be" with the stock cam to run on 93 (or 91) octane. Those pistons will have some amount of dish in them to get to the needed clearance volume.
Welcome to the fold.... looking forward to hearing more about your plans.