I have had the same problem, with shorty headers also, but when i put a high torque on there it took care of it. You might have a wire problem. I would replace all the battery cables and make shure you have good connections.
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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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