Alt advice
All you need to do is use a dual field alternator with a small external voltage regulator. I did add a new cable with fusable link from the alternator to the starter relay.
Sorry I disagree completely with the idea of a different regulator. There is nothing wrong with the factory regulator, if replaced with one that properly works. Most replacement regulators for the pre--70 stuff is already solid state.
(There is ONE possible problem linked to the regulator / field circuit, and that would be low voltage TO the regulator caused by voltage drop in the ignition harness. At low RPM when the alternator cannot keep up, the field current may drop additionally at idle, worsening the problem. This is often the cause of the cyclic "dim/ bright/ dim bright" low voltage oscillation that occurs in some cars. This is OFTEN not a regulator problem, but rather a harness voltage drop problem)
"Dimming lights at idle" is not repaired by replacing the regulator. It is repaired by using an alternator which PUTS OUT MORE at low RPM.
What I find amusing is that with all the changes you noted, in your photo you still have the old round--back style, which are noted for low output at low RPM.
If you have a big stereo or something, be sure to add it at the starter relay and not inside the car, as it would have to go through the bulkhead connections and that's not good. They are wimpy enough to begin with.
This I agree with, but ONLY after having improved, repaired, or bypassed the bulkhead connector. Otherwise, the charging current has to go in/ out of the bulkhead connector
