Eric, and everybody else, I hope ya don't mind me pokin my nose in for some clarification on heads and compression.
I realize pistons, gaskets, decks, chambers, valve reliefs, etc. have everything to do with compression and I was going to put 291 camelhumps (64cc) on a 350 with flat tops. From what you're saying I'm looking at 11:1 compression? I'm going to have to rethink my buildup in that case and sell these heads because I want to stay under 10:1.
The last 350 with camelhumps I had used the same setup, except maybe dished pistons (I never had the heads off). It ran fine on 87 and 89 octane, and I had no problem with timing/pinging/knocking, etc. and it ran bada** strong! That was with a mild to mid cam, HEI, 600cfm carb, nothing special at all.
What do you think? Am I missing a crucial link in all this?