Any pics of what the OP's car looks like? If it's "stock-ish", then the blower under the hood maintains that appearance. The extra weight of the big block will likely change the handling characteristics of the car on the street, if that's of any concern.
FWIW, I checked out the specs of the blower mentioned and it says it needs "premium" grade fuel; does CA 91 even qualify?
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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