charging issues

If your 73 has a electric choke assist , it's controller is mounted with one of the coil bracket bolts. Disconnect that things power supply. They can short out internally and cause all sorts of issues. It's not absolutely required and probably doesn't function properly today anyway.
While in that area, seperate the off white rectangular harness connector the factroy added there. Your alternator and other wires pass through that connector.i've seen meltdowns in that one too.
There is also a few harness connectosr behind the left kick panel . I've seen one of those melted too. A little moisture and subsiquent corosion over 40+ years can reek havok on electrical.