I was gonna say the same thing, Chevys are incredibly cheap compared to Mopar. You can build them for a lot less money. Besides that, it seems that Chevy is just more popular then Mopar when it comes to drag racing. Same with Ford. That's just the way it is. Mopars are still the best. Think about it though, how many AMC's do you see? There isn't many left, and the people who do own them usually don't risk them by racing them.
There was a Pinks a while back where a Red Challenger made it to the semi finals; I don't remember why it lost.