I had 4.56's in my AT '79 Z/28. Only did about 110 mph(3spd) as I remember, but it was a monster between the lights for only around 250-275 crank hp.
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Roto-fab CAI
Unobtainium Welding Exhaust
ARH LT's
393whp L99
GPI VVT Turbo Cam-in
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