I am at 11 to 1 and I run 91-93 octane with 30 degrees timing. The chamber is the key I think. No pinging, no running hot, all seems ok. I was a little worried but my cylinder head guy said it would be ok. Good vacuum and street manners even with Victor intake, he said it needs compression to pull on the large CSA port/manifold.
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65 GTO, 3800#, 474, KRE Dport 330 cfm, 11:1 on pump gas, XE 242 248 solid roller, T56 trans, 3.90 gear, 11.26 @ 124 mph
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