I'm going to disagree with your engine builders opinion of controlling the temp with the fans, while that will work at low speed in traffic, it will not work when moving at highway speeds with airflow through the radiator. Fwiw I have a 750+ hp enine that spins to 8K and it cools just fine with a stock GM pump and 195* thermostat. Imho there's no need for fancy high flow water pumps, running the engine too cool is not good for it either. Ideally you want it warm enough to get the oil to get to 212* to boil out the condensation.
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