Thanks for the info, however everything is NOS with the exception of the radiator which has been recored. The issue is that there is nothing that has not been checked or rebuilt other than the NOS items. The pulley ratios are what are called out in the service manual as far as the ratio is concerned, the thermostat is a 160 degree unit and the temp gauge is installed right above the temp sending unit in the water pump adapter casting and is a new laboratory gauge that is calibrated. There are no restrictions to the airflow and the radiator has been flow tested twice and flows as it should. The car did not come from the factory with a shroud. The short of it is there is nothing that has been checked that is not correct other than a casting defect in the block. The car runs very cool on the highway but at idle it overheats; this would lead one to believe it is a coolant flow or air flow issue but when we ran the engine before installing it in the car the water pump flowed properly. The fan is a standard 18 inch non clutch type that is correct for the car. Everything is correct for the car but it still overheats.