Well, I made to Woodward.......drove a few miles from Pontiac to Birmingham.
In Birmingham, all the cruiser traffic slows to a crawl. Thought car was running fine, then the temp gauge spiked to "H". Has to stop right on Woodward. Thanks to all the Mopar people that ran over to offer support. Charger R/T owner had extra coolant. After 30 minutes car started and I was able to pull in a side street. Amazingly there was another E-Body Convertible (1970 Cuda, 383, Red, Nice car) and the owners there. All the big block Mopar people were saying they also overheat in these conditions (90 degrees + parking lot).
Very embarrassing and frustrating, but silver lining we met a bunch of super nice Mopar and Muscle car people.
Anyway, I'll be looking for some troubleshooting tips and cooling recommendations soon.
Be back to Woodward and other cruises soon (may take a gallon of Prestone next time)!!