I don't want to get too far afield down "GTR hoods" but NONE of the reputable companies (high end JDM or OEM/Nismo/N-Attack) have the NACA ducts positioned at the REAR of the hood
They are much closer to the middle, if toward the front (usually in combination with additional release vents)
I've attached images of the Z1 Time Attack 370Z (custom) as well as a Super Taikyu Z34 (Ings+1 hood).
or we can use are brains
cold air in through the front
air flow front to back cools engine/removes heat
hot air escapes up and out the back, and possibly side if you have venting there
there's really no sense in putting an air INLET at the back of the hood, unless you have a convoluted physics defying setup underneath
but i don't have an engineering degree
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