What he negelected to mention is the fact thet he is running a 3000 stall converter and the trans may be slippimg. This is with a 25" tall tire and 3.55 gears. He is running 3000rpm at 50 mph. He's turning some high RPMs at 65-70. I checked his airflow and there is plenty of air getting to the radiator but the fan he's using has a lot of blockage coming out. the fan housing has a bunch of close set ribs, about a 1/4" apart, that seem to keep air from coming out of the fan as well as it should. Timing and carb are good. It will sit forever at an idle or run around at city strret speeds without and heating trouble. I recommended that he cut every other rib off the fan housing and see what difference letting the air out did. I also suggested he swap to a more street friendly converter.