That scoop is definitely not too big for the car, my hood scoop is the same size Hemi scoop. It has a functional hole in the hood but with the fact you cut thru structural members it has a reinforcement ring added. Hole is about 16” in my hood and I run a 4x14 air filter up thru it. If you would like a few measurements let me know. Additional information is your scoops mounting bolt holes will line up funky on the reinforcement underneath so expect struggles. I did not do this job originally on my hood but did repaint and remount the scoop better this year.
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