I have over 520 hp and still use the stock water pump. Compression is 10.5:1.
Even with my old stock rad I could sit in traffic all day and barely break 200 degrees. With my new Fluidyne, even after a high speed run on the highway I can sit idling in the 90 degree sunshine in my driveway and barely get to 200 degrees.
On the highway I have to turn my fans off or I would drop to 160 degrees. And that's on a hot day!
I think it has more to do with good new cooling tubes, hoses and a proper thermostat - along with good engine circulation, ventilation and oiling systems.
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