05 Jeep 5.7 complete setup

I'm doing about the same thing, as I'm putting a 5.7 Hemi from a Wagnum R/T into a 70 Duster. The transmission you probably got is a 545RFE, and you can indeed swap the tailshaft housing to make it a 2WD transmission. I'm using the same transmission, but bought it out of a smushed 2007 2WD Durango. You have to hack the daylights out of the floor pan and crossmember to get it to fit, but it's not that big of a deal. Hopefully, you got the computer with the motor. You can buy a wiring harness from Hotwire auto to make it run, and I think it's about $900. I just bought headers and motor mounts from TTI, and they were a thousand bucks. I bought a Milodon pan,pickup tube and windage tray...and that was $400. The cost adds up quickly, but I bought a 6K mile motor for about nothing...so I won't complain. Read around the new Hemi forum here, and you can learn a lot. Good luck.