67Dart273 said

You need a 70 and later alternator. The later alternator has two field connections. These are often improperly called out as "dual field" the proper term is "isolated field"

Whether you use the later VR or not you should get a late enough alternator that it's a "squareback" instead of a roundback

The type on the left is what you want



The basic difference in wiring is that a second wire must be added. Switched 12V "ignition run" must be run to the second field connection on the alternator

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