I guess it's possible there might have been two hood part numbers: one for the hood with the scoop installed, and one for the hood without the scoop. But the holes on the underside of the hood for the stud mounting nuts are there either way.
I'm not sure the fact that the holes are cut perfectly on some hoods is strong evidence of factory installation. It's possible to make a very clean cut with the right tool and technique.
One note about the parts interchangeability book referenced here. Check out the descriptions of the hood packages for the other (non-A-body) vehicles. They all specifically reference "fresh air package." The description of the Dart Sport hood only says "with scoop." There's no reference to fresh air.
