Lets see if I can remember that long ago! If you increase the air flow on a s/d system it will affect the way it drives (poorly)I was o.k. with ported stock heads and exhaust work, but when I added the cobra intake It was time for mass air! But I did run 13.20 on a sticky tire, must have good valve springs, and shift it good. 1.7 rockers did help some!
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