How much DCR this calculator gives you?:
http://kb-silvolite.com/calc.php?action=comp2
With that cam, good quench (0.040"-0.050") and efficient coolant system (try to keep it under 200), I don't see a problem running 11.5:1 compression on pump gas.
Or you could run 13:1 or even more with E85, especially with that big cam.