Am I right or wrong???

OK then.... your Hood actually has the basic template built in!
The '72 Dart/Demon Hood has the cutouts for either style of Hood Scoop(s) pre cut in the Frames.
I just Center Punch the correct holes for the Scoop(s) I am installing and follow the Scoop(s) Studs for the rest.
I HIGHLY recomend reading 7demon2's post mentioned by 3404speed above before starting this!

Hope this helped,
Later,
Bruce B.