American Auto Wire Install??

70dart340 said

If at all possible, get yourself a sheet or to of 4X8 plywood, and put your stock harness on it, and build your new harness side by side with the old. Upgrade your wire gauge and connectors next to it. Just my opinion, but I wired 747's for over 22 years using this method. It's working on my 70 Swinger 340, with bigger wires, and the mods needed for a modern car. Just my .02.

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These American Auto wire kits are already pretty much pre-length and whatnot. They're already built..
I wouldn't throw away anything from the old one until the new one is running on the road but they do have a lot of plug and Play items already. They are pre wrapped they're not just a fuse box and a ton of wires sticking out of it...
For routing purposes and ease of installation for the headlights tail lights and Park lights they give you new bulb holders and plugs you just need to make the connection between the two. They even give male and female connectors for that as well. These kits are very expensive and pretty damn complete again except for the windshield wiper sometimes that's some stuff you want to make sure you keep...