I would think that the ram air will help a bunch. My '72 has had a Stealth on it and the carb was very close to the hood. Opening the scoop isn't gonna help. It is too short to do much if anything at all.
I bought the same thing but mine was cheaper. Took me about 2 minutes with some chrome polish to remove the "scratches" on mine! Using it on my '87 Mustang, routing the intake tubes to the fog light holes.
Never thought about looking for a cheaper deal, Dont have a ton of time to shop Driving a Truck OTR. I wanted to get something I know would be there when i get home , Got one day to mount tires ,install LCAs and ICM brackets ,Change oil and install the Ram Air before I race. I will p[ost my results.