My 65 GTO 389 # 77 heads tri-pwr was done 60 over, 5yrs ago. Used 400 cast pistons and 744 cam. Everything else was left stock. I do have a 4sp. 4:33 gear. I use 93 plus 5 gals of 100 LL av. gas for a full tank. So far not a problem. I have also used 1gal of 110 VP race gas per tank.
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