Best wiring harness for 73 Duster

Ease of installation is relative, depneding on your skills and patience.

M&H makes really good, factory stuff, sold only through Year One, though. If you want factory replacement, this is it.

Ron Francis has a couple of Mopar kits. I have used RF for racing applications, good quality, good directions and tech support. Probably my second pick.

American Autowire makes really good stuff, too, but not specifically for A-bodies.

Painless has a generic Mopar kit, good quality. Doesn't usually have all connectors and sockets. Probably my third pick.

I'm sure there are others, but I've never used them.

Make sure you compare kits, understand what they include and what they don't. Make sure you can find the items they don't come with.

Good luck.