Flickering or pulstating Headlights

Must just be the old style regulator causing the flickering. I installed a voltmeter instead of using the ammeter. It gives you a better idea of what is happening with your charging system.
It certainly might help. I think that the newer replacements are electronic inside instead of mechanical even though they look like the old regulator. Again I prefer the newer style charging system but that might not be an option for you at this time as you might have a grounded field alternator.