For a Cuda, "Barracuda" by Heart.
But, for a Challenger, Theres an obvious choice as well. The soundtrack to "Vanishing Point". Not the whole thing with the strange off the wall stuff played by the DJ. No, just that background instrumental that runs through the movie as Kowalski is driving.
For my black 68 Charger, I have the soundtrack to "Bullitt". I need to make a separate recording of just the instumental music leading up to the chase scene. I wonder if anyone would notice the connection if i drove the Charger to the local cruise-in with that music playing.