Probably 20 years ago my 68 ran its best time ever. 12.35 @110.50. 72 455 HO thru the exhaust (headers) 2 1/2" pipes and Dr. Gas crossover. w/3:55. Don't remember what carb or intake I was always trying things. Today 12.50s with an HO intake and Cliffs Q Jet same motor. Thats letting trans shift 4,800-5,000. 20 years ago M/T 9x28x14 slicks on widened Hurst wheel 14x7. Rhoads lifters. Used to follow Jim Hand/Gary Carnivale articles in 421 club newsletter.
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