69 Cuda - Entire Electrical

In my opinion, 50 year old wiring is a fire waiting to happen. Especially if you introduce an upgraded charging system. I got all my harnesses new, from Layson's, they'll have them built to order, just call (on a Saturday) and ask to speak to the guy who handles them. I forgot his name, but he took the time with my situation and was very knowledgeable.
They're not cheap, but it is worth the peace of mind, especially if you have to trouble shoot anything down the road, you will know that the wiring probably is NOT the culprit.