got some info...
http://www.1jzgte.com/1jzfaq.htm
http://supraforums.com/forum/showthread.php?t=292754
-some info i thought was important-
The 1j swap can only be a direct fit in the 89 and up mk3's that use the newer round style motor mounts. If you have an 89, check first, the model change split that year. If you have an 87-88, you'll need to either locate a 89+ crossmember or make some custom mounts up. The crossmember from the clip will not work without serious modifactions. Due to it being RHD, you will need to modify the mounts for the steering rack.
Some items you'll have to buy when swapping this in are a mkiv TT throttle cable and also a high pressure powersteering hose from a 93-94 mkiv supra.
Some parts crossover to US part numbers, some do not.
not an easy swap.