Back in 70, I cut the back of the scoops out on my new 383 4spd Cuda & had to also remove the dummy trim on top of the hood, that really defines the scoops overhang & look. They're a 2 part "scoop" & when you remove the outside 'bezels', they loose their beauty, IMO. I glued black mesh behind the opening. Don't think I realized any gains at all, since they weren't sealed.