In my experience that's not exactly correct. The 700r/4l60s behind fuel injected motors are still computer controlled in that the computer controls torque converter lock up. In applications with a carb motor the lock up is vacuum controlled. I had to deal with this when converting my computer controlled 700r to a carb 350. It's a minute detail but don't want anybody to be mislead in thinking the won't have to deal with a computer on an originally fuel injected trans. As said above the lock up kit is the fix when dealing with this swap. It's also good to note that the 83-84 models are slightly different than the later carb models and arnt as strong. Here's some good reading on the 700r/4l60.
http://www.transmissioncenter.net/700r4.htm