The generator shop called today and said that the problem is in the armature winding itself. The field coils, brushes and springs were not the problem.
I told them to rebuild mine completely- new armature, brushes, front and rear bushings. This also includes a new heavy duty voltage regulator, tuned to the rebuilt generator.
Total cost is $135 for everything with 1 year warranty. I'm happy with that. The 430 with A/C generator is a 35 Amp unit, which is hard to find anyway, and this one will bolt in.
JohnG gave good advice on having a good in town Auto Electric shop rebuild mine -- Thanks John.
1960 Hard Top/430
Thunderbird Registry Number 1231