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I just meant sealing off the nose, not sealing the engine bay airtight. That would be nearly impossible anyway. Even with all the gaps sealed and a full belly pan, there would still be plenty of airflow. There'd be less heat to deal with as well, since the radiator(s) wouldn't be there anymore.
In most cases a person converting to rear-mounted radiators would still have a giant hole underneath the engine. Plenty of ventilation. Check out European Rallycross cars to see how it would be done.
In a car designed from the ground up to use rear-mounted radiators, like the Lexus LF-A, there are additional aerodynamic benefits. Not only did they get rid of the big parachute-like hole in the nose and clean up the air going under the car, but they got rid of the big rectangular radiator (and radiator support) in the nose. That allows the nose to be shaped for low drag and high downforce without concern for radiator packaging.
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