Those mice were hungry!
The Pantera uses "Marine grade wire". It's an upgrade from automotive wire and is tin plated.
Some people think that it is crap but they are unknowing and they are wrong. It will last much longer then regular automotive grades.
I've seen several attempted race car conversions where the first thing that they do is rip it out and try to rewire the car. Somehow that never seems to work out. Leave the stuff alone. It's usually a previous owner that didn't know WTF they were doing that caused the short.
I personally find it tough to solder and use high quality crimp butt connectors on it. You just can't use those 3M "guillotine" quick connects on them.
Even if you do successfully solder the splices you still will have lumps in the wires like a snake who just swallowed a pig.
These cars are approaching 50 years old now. Most buyers are going to accept that and that they have had repairs made to them.
They just want a high quality repair.
Those wires with the spiral stripes are going to the fuse box. Depending on whether or not the spirals are close or spread out indicates their polarity. That tells you what side of the fuse box connection they go to, i.e., in or out.
Previously Jon Haas told me he found the source of them and was able to purchase replacement wiring for them. If they don't match it probably would be because the original wire color has faded over the years or needs a cleaning off of the surface oxidation?