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Cowl hood scoops are supposed to provide pressurized air to the carburetor inlet at highway speed. The transition between the flat hood and the rather vertical windshield of old muscle cars created a very high air pressure at speed, and the cowl scoop took advantage of this to provide a "cold air" intake with a little extra pressure on it. These do not work well to vent hot air at highway speed.
I have seen pictures of tri-5 shoeboxes run at the Silver State classic road rally with tons of aero tricks to try to keep the front wheels on the ground above 100 mph. Some of those folks cut a wooden block for each rear corner of the hood that's about 3/4-1" high and slam the hood on them. The raised rear corners of the hood bleed off underhood pressure as they are further from the stagnation point in the center of the windshield and the gap runs parallel to the air flow. Placing a side- or rear-facing outlet near the windshield will have to be done with care, and probably by moving it far toward the sides of the car.
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