Anyone know what it takes to put a Viper motor in a challenger?

Hey guys I have a 1973 Challenger, I am looking for a bigger better motor for it, has original 318 right now. But anyways I found a viper v10, the guy wants 7,000 for it but talked like he would negotiate a better price. It has 6,300 miles on it. Anyways anyone know what it would take to mount it up in the challenger? Would it just be a matter of different motor mounts? Or would there be alot more involved than that? Also it doesnt come with it, but if I did it I would put the viper 6 speed behind it.