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JEGS 40004: HEI Advance Curve Kit Fits 1974-1979 GM HEI without
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VACUUM ADVANCE KIT, ADJUSTABLE
Moroso 72315 VACUUM ADVANCE KIT, ADJUSTABLE
Ask Away! with Jeff Smith: Matching Up Vacuum & Mechanical Advance
ACDelco Professional D1321AX Ignition Distributor
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HEI DISTRIBUTOR VACUUM Advance Eliminator Lock Out Plate Kit GM
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GM HEI Mechanical Advance Tuning