The GM 1971-80 Tuneup Spec Manual ( SD-100)..... lists several hundred part numbers for the HEI distributors used with GM vehicles.....The proper distributor for each engine is listed.... primary difference is the amount of centrifugal advance built into the distributor for the application involved
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'71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).
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