Mystery hood scoops

70/71 Duster hood scoop , Ok I have owned a few duster's in my time and always liked the look of the single double scoop and the single double hood scoops , I know that they are original mopar products but have never owned a duster with factory originals, I am dieing to see a "UNDER THE HOOD" pic of an original, were they functional from the factory, or just for looks? Kevin