MSD or not

The only reason the "OEM" stuff you have works is this: "The youngest box (Chrome) has been in over 20 years". Anything made recently is pure junk from the Chi-Coms, or worse. I've been there, done that.
Maybe, maybe not. I have some excellent working chink ****.
And the Summit kit has the same crap Chinesium parts in it. Been using MSD stuff for the last 15 years with no problems, no failures.
Good for you then. From my point of view, you have a good box. I had only one. It still works. 30 plus years? Long time......

It seems your saying that all ignition boxes are made in China and they all suck.