Is there much room under a (VH?) bonnet? I'd have thought that a 1UZ under that bonnet would not leave a lot of room for anything else, least of all turbos.
It's pretty tight under my Cressida's bonnet and I actually thought the engine bay in mine was a bit larger than a VB/L Commodore...
Still, good luck with it! A TT 1UZ would be just about the best engine package I could think of, providing it's done properly...