You guys need to remember also, just cause you buy "10.5 to 1" pistons, DOES NOT mean the engine will be true 10.5 to 1. Most of those engines were lower in compression than that. Its a blueprint spec...
I did my calculations empirically, the stack ups don't matter. My results were based on bore, stroke, compression, and a known head that I've cc'ed. I left it open for him to apply to his application.