IMO the Challenger is one of very few cars that are perfectly complimented by pins. On many other classics the pins just look out of place, but not on an E-body.
But it also depends on what you want your Challenger to represent. Like the individual style of your car. Do you want it to be a classic cruiser, or a menacing beast?
Personally i'm going for an aggressive musclecar look, so pins are a must have, as well as wide rear rubbers. But for example on a stock 2-barrel 318 or even 6-banger they would give off, well... kind of a wannabe vibe. (Although they'd probably look good nevertheless)