Might need drive shafts too(length may be an issue)..Find a complete donor in the yard and go to town. You can use a 4 door donor for most everything I think with the exception of the rear drive shaft..

As far as electronics go there are two only two items you need to worry about, the AT temp light sensor, and the overdrive solenoid. I would rig my own circuit for the solenoid if doing a conversion..use the switch on the shifter in conjunction with a relay to energize it. The stock setup runs through the temp sensor and other such nonsense that you can simplify by eliminating.. The trans is controlled internally along with the cable, make sure you get the whole cable wit the little bracket. It should hook right up to your 3.0 plenum and throttle body.