there seems to be some unknowns in the equation as far as figuring out a true compression ratio.
assuming you have a 4.350 bore and 4.250 stroke, the swept volume is 505.2976 at .010 in the hole with a .039 gasket with 4.410 bore in the gasket (9.7600 cc's) with a net 17 cc dish and 74 cc chamber, your C/R would be 10.9891-1
with a .027 X 4.410 it would be 11.3287-1
the real determining factor in my mind would be the cam specs. where does the intake valve close abdc? that will have more effect on the cylinder pressure than any one other thing mentioned. c/r by itself means very little IMO. i've built plenty of 12.5-1 motors with 185 psi cranking compression and conversely i've built 10-1 combo's with 200 + psi cylinder pressure.