Any advice for an old man who has a buddy that has overheating problems with his 52 ford flattie. It has new water pumps from speedway motor and the engiine is stock except for a .030 overbore and a dual intake with 2 94's. The shroud and mechanical fan are stock and the radiator has been flushed. The truck is ok when moving with the temperature around 190-195 degrees but let it idle for a minute and it will boil over. Just running 10 percent antifreeze along with water. We took the engine apart but block looks good with nothing to impare the water flow.