I have a 70 Dart, 318, auto, with AC. It has a 22" inch 2 row radiator , 19 inch HD clutch fan, 180" thermostat, 50/50 mix. The other day, about 85 degrees, going down the interstate at 70 mph and 2500 rpm I was running about 215 degrees. At 75 mph it went to 225-230. At 55-60 it runs about...