Interesting to bring in aerodynamics of a particular hood scoop design on a car that is otherwise shaped like a brick LOL. Remember, the very next year after the 1968 Hemi scoop was the introduction of the Dodge Daytona Charger because the grill was catching too much air in Nascar lol. I agree that Mopar did all the R&D to set up these cars to do any type of racing available back in the day, and is invaluable. But for this application looks are more important than speed and it isn’t stealing that much horsepower thru the air to hurt the seat of the pants dyno in my Duster, so it’s perfectly fine. Can everyone please step back and remember everyone has different tastes and the OP asked how to install the Hemi scoop, not should he. His decision to use the scoop was made, now he wants it to function and not fly off. And last I checked Mopar had and installation guide for that too.