Nice looking Car.
What is an oversized Cam? Is that cam a 218/218 single pattern cam? What heads and compression are you running? Have the heads been worked? What intake are you using? The rear end ratio will also play a large part in the way your car performs and matched to the rest of your combo. A peg leg rear will not be anywhere near optimal for launching that car. The other questions need to be answered before any guesses could be made.
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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