We live and learn! After cleaning up wire terminals, defecting out the rebuilt starter, insulating starter unit, I made a discovery! On this 84 310, there is an additional solenoid mounted to a bracket just in front of the air cleaner. After messing around with a tester probe, I discovered the lead to the starter was pretty rusted and actually was keeping the test light from shining brightly. After scratching the rust slightly, I got a brighter light and WALA the fool engine started. Replaced the solenoid with a matching napa part and have now been start happy for 20 tests. It may be my imagination, but I think I am getting a higher amp reading as well??
Hope this helps somebody else down the road.