You can safely cut out the "diamond" area within the underhood bracing. Many of the studs should align with holes in the bracing for access with the nuts. Might require a little trimming larger for clearance. There have been threads about locating the scoop and someone may even have the template. But I used one of the center holes in the bracing (I believe it was in the rear.), and the rest laid out fairly well.
FYI - Never available on Dusters and only on '72 Demons and '73-'74 Dart Sports.
There are actually 2 OEM versions. One has just about a flat base for the Demon and the other has a little raised area to accommodate the corresponding raised area of a Dart Sport hood. But people have used them on incorrect hoods with minimal issues. AAR may be able to contour the base fit either one, or a Duster hood.
Tried to send PM, but box is full!