We put a pair of them on my friend's 200+ hp 261. They work great. Only problem is with the manifold, which is an Offy for dual one's. The ports aren't big enough for the 2 bbl carb to flow properly.
He has a Saginaw 4 speed with 3.90 gears, said he was doing burnouts with a friend the other day. About halfway through 3rd gear the tires were still smoking, and his friend about wet his pants, so he shut it down.
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