what transmission to use with new hemi 5.7

Guess I'll keep looking then. Prices here are insane.
Guy on Craigslist wanted 2k for a t56 disassembled missing input shaft, another wanted 1k for a 05 hemi stock harness and computer.

HOWEVER, bouncing ideas off a buddy of mine at work, he has a nice camaro drag car..He thinks that getting a t5 just to get something going and started, would work. He says the bolt patterns on the newer transmissions are so close, the bellhousing from quicktime would crossover, say from a t5 to a t56..with little to no modification to the holes....this sound accurate?