If it were mine, I would use no hood vent at all, and go with holes in the inner fenders to vent to the wheel wells. The wheel wells have low pressure air so they will suck the high pressure air right out of the engine compartment very well.
Just cut the holes there down near the axle so that there isn't a large amount of tire spray flying back into the engine bay.
Also use a grill block to keep out more air than you need for cooling.
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