I just rebuilt my motor. It is a 306 now with AFR 165 heads and a F303 cam the timing is set at 13 degrees with the fuel pressure at 40 lbs. I bought a 3 row aluminum radiator and a mark 8 electric fan with a 160 thermostat. In the morning when the temperture is 60 it runs at 150 degrees but in the afternoon when it is 80 it runs 180 and then if i sit in a couple of stop lights it climbs to 210. What could the problem be and is 210 to hot for a motor to get and what is an un-safe temperture.