I bought a complete set of M&H harnesses for my 64 Savoy through Classic Industries. classicindustries.com
I bought the Evans engine harness, good quality. I'm looking to change my wiring harness and get away from the Mopar bulkhead connector. Wires under my dash are a melty mess.
I had to recrimp my new harness after I found some loose terminations. I think it was from year one. Otherwise happy with the fit and quality. I also rewired it for a larger capacity alternator and changes to my ignition system.
https://www.yearone.com/Product/chrysler-b-body/hu22