Big block, with the alternator on the passenger side? (oops, sorry, didn't look at your pictures)
If so, I've posted a series of pictures on my web site that show what happened when my original harness burned while at the strip.
Do you have a made-up harness or are you winging it on your own?
The reason I ask is because the original harness has a plastic strip that features little retaining clips that hold it to the radiator support. (the harness is all made up before the car is assembled, of course, so the clips just get pushed into the holes of the support) Let me go get some of them, be right back.
Most of these wires are for stuff like fuel injection and ignition and lights. Look for the 'melt'.
Note below, the new wires installed. I used 8ga to replace the originals. Also look where the wires turn to go around the radiator support. See what looks like a split rubber hose protecting the wires from the sharp edge of the support? You know, so they don't get worn through again in 43 years?
Below is exactly how the factory wired the 'big' wires, using a lug. I just used bigger wires on the right.
Here is where things went to hell. Note the indentation where the harness was pulled tight against the support. Also you can see the very beginning of the mounting strip. Look at the blue wire and just above it is the black tip of the strip.
Looks really bad huh? But this might help you to determine which wires go in the harness. Hint: When in doubt, include the wire.
Also, as bad as this looked, the total damage was to the red wire. Cost $10.00. Why so cheap? Because my battery is in the trunk. And I was racing the car. That means a battery switch has to be at the trunk to cut power. When the smoke started, my car stopped. (on the return road) The smoke was white so I jumped out and smelled it and then ran to the back and cut power. If the smoke was black, forgetaboutit.