I replaced EVERY harness front to back in my 70 Charger with M&H's repro harnesses, the only used factory harness I have in the car is the power window set up that I added and a NOS factory steering column harness, and only because those items weren't available from M&H, last thing I want in any restored car is a 40-50 yr old harness(es)...

I'd recommend M&H, my Charger was retrofitted 14 yrs ago, ZERO issues with electrical to date...

Your looking at about $1500+ in harnesses from M&H to rewire the car if you go that route, with the dash being the most expensive, but the other harnesses will quickly add up, I ordered everything thru Year One, the only licensed supplier at the time...

Mike