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I'm not saying one way or the other but, doesn't
Don Little run a 383 in his 70 Challenger?

Currently 9.70 @ 136.20 in GT/FA (S/S)

This may be true but to reiterate Al's point, How much is Don Little gonna sell you a set of those heads for? And it's not just those heads that makes that car run those numbers.Those guys do things to those cars we can't imagine,thats why they are so impressive.I have seen some stock eliminator pieces being made that would blow your mind for a hundredth or two gain.Those guys are nuts ,IMO.