[HO455]

There is a a 71 at Ram Light Trucks parts off of Columbia Blvd. It was a running truck that was wrecked and it may have a better underdash harness than your current one. The truck is a V8 truck so the engine harness wouldn't be right and the front was hit so the headlight harness is likely damaged. Those guys aren't the cheapest so ask the price before you pull it.
I would start by taking the alternator off and have it tested. It may be over charging. New may not mean good. If it is good then the wiring between the alternator and the regulator has a problem causing the alternator to over charge.
Your electrical problems may have damaged the coil and or points causing the poor performance. So for the short term I recommend concentrating on getting the electrical side back on track. Before doing anything with the carburetor or engine.
I also recommend doing a thorough inspection of the underdash harness for any signs of overheating.
Do a search here for wiring diagrams. Then a search on alternator light problems. My guess is you have a damaged/missing wire in that circuit to that light.
I am assuming you have an aftermarket voltmeter installed?
Good luck neighbor and keep us posted.