Need some help figuring CR

By the way, I had a 360 with TRW forged flats (no reliefs - old school) that ran like a beast. We tore it down and were just going to "re-ring". By the time I got thru the math, it was less than 8:1. Not one of us believed it based on how well the car ran around town with a big cam. Ended up getting new pistons and upping the compression to 10.12:1 I believe with heavily cut "J" heads.
Ya, im at that point where I'm kicking myself for A. Not zero decking B. Not upgrading pistons C. Not milling heads.
I still have the heads off, and ready for a light port...just might take them back and have them take off .030...assuming the CR Calc is more correct then Chrysler was.