The OEM Ford scoop is the way to go. The inner structure of the hood is already stamped for the correct positioning of the factory hood scoop option.
Also, if using a later Comet Gt version (NOS scoop pictured) you will want to move the front pair of studs to the outermost hole locations; from D14B (Comet) to C9WB (Cougar). You will also need to move the rear inner pair of studs from the front boss to rear boss. That stud layout pattern will be, and is correct for mounting the scoop to any 69/70 Cougar OEM hood. The thumbnail pic should enlarge for a better view when clicked.