For $100 you could replace the main wiring harness and be a lot better off the way it sounds.
I already had a new Year One engine and wiper harness but bought the AC ($25), roadlamp ($60), and transmission ($25) harnesses from this guy at the Nats and it's good stuff and would have been cheaper if I would have gotten everything from them and had I known about them then I would have.http://evanswiring.tripod.com/evanswiringharnesses/id3.html
So, besides your battery cables, you could replace all your underhood wiring under $200 (you wouldn't need the roadlamp wiring) and when you have the right harnesses with the right ends on it, it almost wires itself which is good because the harnesses don't come with directions but he said call if you had any questions.
The guy even shows his Hemi Cuda on the site too!
You could also check with your local Mopar dealer to see if they have any old service manuals you could look at / copy.