Great replies all!
Along with wirebarn.com you can also get GXL wire by the foot at https://4rcustomswire.com/.
Yes, car technology was good then but look where it is now. 3 speed tranys vs 10+, crazy HP out of much smaller engines so on and so forth. Not only that, some of the stuff I'm looking for just doesn't exist any more. Can't run to the parts store for tube fuses and no more radioshack. Although I did recently notice they are back online, but they are moving to sell crypto. They do have some of their old stock though... I'm getting 1.5v through some wires that look great, when I should be getting 12. That is a big reason I've decided to rewire. Not only that, some previous owner(s) really did some sloppy work in the engine bay. Some of the terminals I've checked in my light sockets are literally crumbling. I guess I'm just the type if I'm going to do something I want to make sure its right, at least to the best of my abilities. I recently changed all the vacuum lines to silicone. The system worked, well after I put tape around an obvious break at the trunk. When replacing all the "working" vacuum lines there were so many cracks in every segment. It was all just waiting to fail.
I will most likely use the silicone tape that you have recommended. Possibly with wire loom as well, depending on the location. Fortunately for me, no big belt buckles to worry about Xframe, can you expand on the bussed switch circuits vs live circuits? Do you mean circuits with fuses and circuits without? I read another tip on this site to, "Change the wiring so that the power to the headlights is drawn from the battery through relays rather than through the headlight switch. That is, the switch activates only the relays rather than drawing all the current for the lights. It will give you better, brighter lights and save your switch." I've haven't started looking at forward of the firewall yet, or at least more than trying to see what color wires there are." Like many of your great suggestions I have it in my notes for this part of my Riviera project. Any specific reason for the third brake light? The flashers make a lot of sense.
Thanks again guys!