68 or 72 Alternator

I'm putting a 340 from a 72 Duster into a 68 Dart. I have the 2 wire alternator from the 72 and the 1 wire alternator from the 68. I know the 72 has electronic ignition and the 68 doesn't. I have a new electronic ignition engine harness from Bill Evans on the way. So, what alternator do I put in the car? I deconstructed then reconstructed the whole car without much difficulty, but I'm very worried about the ignition change. Thanks.