Yeah, it's been done. Get a 5.0L Tbird and take the engine, motor mounts, intake manifold, computer, wiring harness and the various other parts you'll need and just swap them in.
steve griffith has done it, and is now runnin a turbo'd 5.0 in his bird, can't tell you much about what has been involved in doing it, but if you want to either give me an email or # I can have him get in touch with you to talk about it, my email is cato421@hotmail.com