Have them balance all 4 wheels while you are there. sounds like you have multiple tires out of balance. Could also be the tires them selves sometimes though. You will find out once they put it on the balancer.
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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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