What kind of fuel do you run? I think spaz is running pump fuel, maybe that's the difference?
I ran pump gas from 1998 to 2006 with my J headed 360 that was 9.25 to 1.( it ran the best of 10.88.) In 2007 I built the 410 smallblock with eddy heads. My compression now is 11.5 to 1 and I run a 50/50 mix of 91 pump and 110 race gas.