Originally Posted by baystrucksalvag
my old delco points type dist has key way in the gear to turn oil pump flat straight key, my motorcraft dizzy picked up at advance has hex hole key what gives?
The guys at the parts store gave you the wrong distributor.
The 'AMC' years all used a flat 'Beaver Tail' type oil pump drive, Delco points, Prestolite or Motorcraft distributors all had the same drive for the oil pump.
The distirbutor you have is for one of the later engines (later Chrysler 4.0L/ earlier 4.0L engines had the flat drive in them too.),
Or someone has dunked a Ford distributor in the box that was supposed to have your '79 AMC/Jeep distributor in it.
Since it's a Ford/Motorcraft type distributor, I often get the wrong distirbutor in the box, especially from A-1 Cardone (a major Remanufacturer).
Still keeping the year, model, engine type, ect. secret?