My friend Douglas' '70 runs MT 295/65R15s. I like the taller tire myself, but I don't have the gears and/or cubes to pull that so I stick w/ 275/60R15s. That's his car below.

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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)