Thermostat vs. No Thermostat ?

Ok ROCCO!
This is what happened SO FAR! I flushed heater core forward and REVERSE. Very little if NONE scum came out, I installed a FAIL SAFE factory OEM recommended for a 7.2 3x2 engine190 Thermostat ,a NEW 16lb DELCO radiator cap (all that was available in a pinch) I ran it to the Gun Club 30+ miles one way in 85 degree air temp 100'above sea level on the way out she stayed at 190-210 on way home 75 degrees highway she stayed at 180 no boil over so far! I will run it to the car show tomorrow night and keep you posted! I think I'll go with the Champion Radiator with twin electric fans? Your opinion? A MAJOR THANK YOU,ALSO WHAT ABOUT A 180 stat as maybe my cap was DEFECTIVE?
THANK YOU ALSO TO EVERY ONE's INPUT!!!
Mitch