If you are going to tackle this madness, make sure you fully understand what is and is not included in the wiring kit you purchase. By that I mean, are new bulb sockets included, is there new wiring for fender mounted turn signals (if you have them on your Mopar), does it plug into a GM column and you need a connector, does it have all dash gauge connectors, etc.?
I have used Ron Francis for race cars. Perfect. I have not used them for a restoration wiring job.
I have used Painless for a El Camino resto. Good quality, no bulb sockets, only headlight connector. In fact, they didn't have SS dash connectors. I tracked those down myself through Delphi. I would have no problem using their harness, just understand what you need to buy in addition to it.
M&H makes and Year One sells the kit that is most OEM like. Bitch is, you buy each harness separately and plug them into each other. Not terrible, lets you buy what you need, but you have to know what to order. Year One paid for the Mopar development, so the M&H harnesses are exclusive to Year One.
I have not used Evans, a lot of folks seem to like them.