w/ the 6-pack (and I have one) and that cam you should be running a 3.5PV or maybe 4.5. 66 jets, and 31-33 squirtters. also make sure your outboards are opening all the way. If it were me I'd yank the cam and get a good one instead of swapping heads. I was running a 11:1 iron headed 440-6 in this before w/ a 528 M/P solid. Had no detonation issues at all..ran like a MoFo. I had timing in full at 2400 at 36*