Hi Steve, There are a couple of other things I'd like to suggest. I assume you have the standard A.C. Delco distributor. I had a problem with mine back in 2016 I see, which is very Delco specific.
Stay with the points for now, but trace the white / black wire from the IGN coil neg to where it enters the underside of the distributor. There are 2 weak points. One is about 1/2 in back from where the sliding spade connector to the points is . As you can see on mine this had worn through and was intermittently shorting to earth
The other weak point is where the white / black wire comes through the base of the casting and is knotted to stop it pulling back through.It runs close to the base plate.
To check the problem it might be easier to just completely replace the wire.
If this is O.K. let me know as I have another suggestion.