You can answer that by mounting the bumper on the car and testing. If you want the best of both worlds, you can fake up a way of changing the size of the inlet. I've heard of people using a sliding door, or twisting slats (like in venetian blinds), and other ways. You can close off the front until your instrumentation tells you the coolant is getting too hot, at which point you can open the front enough to keep the temps to "normal" operating temperature.
(That temp is somewhere between 180F and 225F, depending on a whole lot of things. My MINI likes to run at 220F.)
-soD
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