I was always under the impression that adjustable uppers let you adjust the pinion angle so as to get a better launch? I dont see why they would hinder anything except they might be a pain to adjust.
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5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear.
Production # 9,377
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