On the topic of radiators. How do you tell how many core radiator your car has. My car had a 326 with 2 speed auto tranny and no AC.But now has a 400 with a 400 tranny. Also lower gears in the rear. My car runs hot and I was wondering if part of it could be to small of a radiator. Already installed 7 blade clutch fan, thermostat, tranny cooler, flushed out fluids. Radiator was rebuilt some time ago but the car was parked for a long time after that. The only thing I have not done yet is check the diverter plate in the water pump for clearance and install a better radiator.