Lights flicker and gauge jumps around???

Darthomas said
The symptom you describe is very common with mechanical voltage regulators, even new ones, because setting the charge/discharge contacts, spring tension, and gap between the armature pole piece is really tough to get right, and when wrong that's exactly what they do.
I expected your Duster would have an electronic regulator, and I haven't encountered that with the electronic type.
Let's move forward and figure this out.
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It is an electronic regulator, standard alternator with 2 field wires, MSD 6al ignition (not sure if that matters) and I completely rewired the engine bay. I haven't had time to try a new alternator or regulator yet, 2 jobs and more important life issues come first.