I have a 67 with 670 heads not sure of my compression ratio but i havent noticed any pinging due to the gas. I put mobil 93 in the tank.
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1967 GTO- 400ci of PONTIAC iron, 4bbl 770 cfm holley,670 heads, headers, 4spd, and a busted fender.
2005 GTO- 400hp of corporate ls2, lingenfelter intake, Corsa sport exhaust, reprogrammed tcm, Boyd Coddington Smootie II's, and a crap load of zaino! 
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