High voltage

Well a 60A should get it done so long as the connections are good (like all of them especially the grounds). To that point, I would recommend you install some extra grounds, its the one thing Mopar did poorly (electrical system). I just finished completely rewiring my 73 Cuda, essentially building a custom wiring system and in doing so did tons of research on the subject as well as having 40+ years working on them. I can say with confidence that any vintage Mopar will benefit greatly from having good clean grounds and well as extra grounds installed (dash to firewall, engine to firewall and frame, etc). Time spent on this effort pays big dividends in the future.