Only cheap HEI works

Slantsix64 said
I think that would be your problem running the early regulator with the later alternator here's the link for the later regulator https://www.amazon.com/CHRYSLER-PLYMOUTH-VOLTAGE-REGULATOR-RESTORATION/dp/B003U2O6YQ/ref=sr_1_3?crid=1AX1PJZCWR8AR&keywords=mopar+voltage+regulator&qid=1574547580&sprefix=Mopar+regulator+,aps,807&sr=8-3

No. You can run the late alternator with early reg simply by grounding one field, which I believe he mentioned