I was having the same problem with my 72 but i was overheating in the streets and the highway, so i put a 160 stat and a high volume milodon water pump with the stock fan and flushed the whole cooling system and woudnt go past 175 and that was doing burnouts, high rpm shifts (having Fun) and still woudnt overheat. turns out the original water pump was no good and there was dirt in the radiator! hope this helps!!