Clean, shiny, and bright is the rule for ALL your connections. If you've replaced the regulator, I'd expect you cleaned up everything on the front end. And it's a pain in the neck to get into the back of the box to clean up the studs and connectors on your ammeter, but you need to get in there, too. And don't forget the connections on your starter (from the ammeter and the hot side of your battery).
ALL important is your ground. Your symptoms are very much like what I had going on my SuperC (also a '51). I don't know where the battery box is on the C, but if it's right in front of the steering post like it is on the SuperC, you will find that your ground cable is VERY short, so there's a lot of tension on it. It doesn't take well to a lot of removing and putting back over time. In my case, the female threads for the ground had wallowed out, and I had to drill and tap the hole out for a larger thread, and get a new bolt. Not sure without dragging out the books, but I think I took it up from 3/8" to 7/16"NF, and it's been fine since.
But that may be extreme. I'd recommend you clean up all your connections, including the ground, as a first step. If that doesn't fix the problem and, if the thread on your ground is set up like mine and at all squirrely (like the thread rolls over when you tighten it down), only then would I look at the thread on your ground.
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