The NACA duct would be useless... much in the way of the scoops on the hood of the good ole Pontiac GTO. Air hits the front of the VX (which is fairly blunt) and skirts right over the hood. Cowl induction is the better way to go... utilizes the vacuum created aft of the hood and base of the windshield to suck air from the engine bay which causes fresh air to rush in to replace the hot. Law of equilibrium.