No paint anywhere. If new CDI doesn't solve my No Run condition, I'll remove the magneto magnet and do a test for the crankshaft seal and general overall compression. Everything looks good.
It could be that the CDI is just a bit too weak to bring adequate spark fire. Hope that's it!
It was the CDI all along, just as the multimeter test showed. The new CDI reads 8k ohms, where the others were showing 5k to 6k. I guess there's good reason why these old CDIs are in my garage.
So now I have a clean carb, new head (milled smooth by sandpaper on glass!), new head gasket, and a new piece of tubing as my extended intake. Smooth.