I agree with you fordkid. That's way too much to expect from a minimal amount of compression increase and nothing else other than an ordinary rebuild.
For difinitive expert opinion on 6 bangers, ask Clifford High Performance what is needed. Believe me, they do know.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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