Quote Originally Posted by NegativeZero View Post
Aluminum heads by Trick Flow. The gas is 100% gas, no ethanol.
With 10:1 compression and Trick Flow heads I believe you'll be just fine with 91 octane, and I prefer non-ethanol fuel personally, for non-computer controlled vehicles or for anything that doesn't get driven a lot (everything I own!). Like Dave & Jerry said, doing the leak down test is a good idea, and if everything is OK there back some timing out and see if it makes a difference. Just my $0.02. There're a lot of smarter guys on here, and decades upon decades of experience!