Maybe I missed it, but going back through the posts, it appears that you assume this is an ignition problem because in the time it took to disconnect and reconnect the distributor, it ran again and also the tack getting jumpy when the running also became erratic. Did you check for actual spark or fuel spray or pressure when it died?
The pickup resistance check can narrow the possibilities and it's easy. Again, if it dies, check and compare to cold/385.
Clean the carbon tracking out of the cap and use a small flat blade screw driver, knife, or file to clean the terminals inside the cap. Are those carbon core plug wires?