hemi 4 speed in early A body

Probably a dumb question.
I bought a 66 dart 2 door post. Want to build some kind of gasser thing with a 440. I also have a B-body hemi 4 speed box. What would happen if I installed that 4 speed behind the 440. I am mainly concerned about tranny length and shifter location. Some guy told me with the right shifter handle i could make it work. But I don't know. I know tranny mount would also probably need work.
Neal