Running Hot

Mike, I'd agree on the "gut the thermostat" part..When it was first done, we used teh belt driven, IIRC. Also, try taking the upper and lower hoses off, and run a garden hose thru the radiator..it should not back up and run out where the hose is..it should flow enought to just run out the bottom...maybe that old radiator is not enough now. Does it do it just at idle? or only after driving it? only after a pass?