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.

Soooooo....how did it run with the over 2 point increase in compression? Basically was it worth going from a pump swill engine to a premium fuel engine?