1973 Duster Build
A 4" cowl scoop will probably hit the windshield when you raise the hood. A friend of mine put a 4" cowl scoop on his 70 Duster, and it hit the windshield when the hood was raised. He had to do a bunch of modifying to the scoop to get it to work. How about no scoop, with one of those air cleaners that has 2 big tubes going back and connecting to the cowl? It wouldn't be any fuglier than a big ol honkin scoop....lol.