I just ran it for about 20 minutes. No stalls, even at higher rpm. I do have some carb issues to work out (it likes to run with partial choke and not without, so my timing may be off for that).
No fireworks seen.
I am still going to see about a new-to-me dizzy during the junkyard tour. Can't hurt. Wires are all new and I don't see any arching.
Keep the suggestions coming. Tomorrow, if the snow is melted enough, I'll head out for a longer test run and see what she does. Still getting the popping and burble on letting off the gas rapidly, but this could be so many things I hate to even mention it.
Did I mention that SWEET and I blew up the muffler on one of our runs a few months ago? So, as for exhaust back pressure....I have none.
Jim