A 71 chevelle ss 454 should weigh around 3800lbs with a TH400. Assuming you weigh around 3200, that's a 600lb advantage, which is around .6 in the 1/4. If you both had the same traction, he would need an additional 60hp to make up the weight difference. It should be close... will depend on what kind of mods, both engine and suspension he has. If it's a built 454, you can forget it.
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Neal
69 stang
351C/4sp
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