1991 firebird

I have a 1991 firebird but I found a 1989 TTA engine and tranny for only 2200 with only 30,000 miles on it. yes it's got the turbo and all with it, but I want to put it into my firebird with the 3.1 and I need to know what exactly needs to be done. I am changing the rear end, transmission, motor mounts, but need to know what else HAS to be done. I also need the computer system for it unless my stock one could work somehow. please help me