A 68 with a swapped 455 is a completely different animal than a heavy late second gen with a wheezing smog motor. BTW, it can't be all original - GM bigwigs limited intermediate car cid to a max of 400 until 1970. I have no doubt your friend's car is fast, but do a little homework here. That's like saying a 73 mustang with a 429 is fast bc a 68 cj mustang was.
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Neal
69 stang
351C/4sp
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