95 360 magnum into a A body?

I have a friend whom just got a truck that has rusted to death. He wants to put the entire motor and trans into his 68 A body. Has anyone here done that? What major hurdles will we have to go through? My biggest fear is the wiring, the computer and stuff will all go right into the car but I am concerned about the ignition switch and certain features like the cruise control. Any suggestions or a good website would be great.

Bill