1974 318 alternator
I don't know if you found an alternator yet, but I have one that came in the trunk of my car. It was on a 1974 318 Dart. The previous owner said it works, but he had changed it to a GM high output alternator. So all I have is his word that it worked, other than that, I don't know.
I can get it to you for $25 total shipped anywhere in the U.S. - that's basically the cost of the 2 day shipping. Let me know if that will help you out.