need advice from the FABO Electrical Gurus

Very correct.

Choose parts for a 70 up Dart or Valient and what ever size engine block it has.

The biggest issue is going to be down the road when someone goes to replace the Alternator and orders one for a 69 and hooks up the wires and shorts out the VR or the wiring.

The rebuilders are modifying isolated field alternators by grounding one terminal. Unfortunately they leave just enough of a tab that you can put a connector on it.