This is a follow up on my original post. The problem turned out to be the Ignition Control Module. I changed it out having exhausted every other possibility. I had it mounted under the battery tray, an area with plenty of ventilation. It was well grounded.
I drove the car 3 days in a row. Never a hiccup. Starts easier too. I had an NOS Orange box, made in the USA stamped on it. Maybe it will last longer. This is a nice car. Original 440 car. Had it since 1979.