I'd say a Barracuda with enough Challenger influences to muddy the waters. The two cars are very similar visually, so there's some wiggle room involved, but what decided it for me was the front lower grille on Cliffjumper, which is pulled whole cloth from the Barracuda (the back end is also VERY similar to the Barracuda). To complicate things further, the new Challenger takes some design influences from the Barracuda.