Thank you so much. I'm a regular on Astrosafari.com, and I was starting to wonder if the lack of response here was due to an allergy to newbies....
I've swapped in a 195* stat in place of the OEM 180*, and relocated my electric fan sensor so as to be located in the actual coolant stream of the upper rad hose. Temps are stable, but I still find that she runs rich. I get around 8-10 mpg city, and 15mpg highway. Not too bad for a 502 pushing a 4900 lbs vehicle with the areodynamics of a brick, but I still think I should be getting better with an average of 15% throttle opening....
Thanx again