70-76 Demon,Dart sport,Duster Pictorial History
The scoop on Dusters is a popular add-on and it looks like it belongs there. But they were not available with them from the factory.
Louvers? Nope.
A Demon hood might bolt on and latch on a Duster because they both overhang the grille. But it probably wouldn't look right.
But whole front clips seem to interchange between A-bodies without too much trouble!