Help; Voltage Regulator and MSD RPM Mod

1970 Dart Swinger with 1971 340


I am having some problems with flickering lights when on, headlights, dash lights and gauge lights.

I have been told that it is probably my voltage regulator. Ok here is my question. I went to look at the voltage regulator to ge the model and part number off the regulator and there are no markings. Nothing...it has the 2 plug in connector, blue and green wire. Blue wire going to balast resistor and green going?

What voltage regulator do I need? I searched ebay and there are a few different models/brands to choose from and I dont know which one to buy?

Also balast resistor?

Next question which I am really just stupid about. I have a MSD RPM Module Selector 6000 - 8000 rpm with a Soft Touch Rev Control limiter #MSD-8728. My question is where do I set the RPM Module switch? What rpm should I set it at???

Thanks in advance