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Amazon.com: Pirate Mfg Mechanical Advance Re-Curve Spring Kit, Compatible with GM/Chevy V8 HEI Distributor : Automotive
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Amazon.com: JEGS HEI Advance Curve Kit | Fits 1974-1979 GM (Without Computer) | Includes Center Pivot Plate, 3 Sets Of Advance Springs | 2 Advance Weights | 2 Pairs Of Nylon Bushings : Automotive
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