I'm doing the 5mge supra swap myself. It's pretty well documented on this board in the toyota tech section.

http://4x4wire.com/toyota/tech/supra/

Also here as well: http://www.4wd.net.nz/suprasurf.htm

I can get the whole motor out of a 86 cressida with the harness if I pull it myself for $200.
The pluses it uses a w58 bellhousing so basically all you do is unbolt the bellhousing from your g54 or w56 and bolt the manual transmission one from the supra. No fabrication required for the engine mounts basically you combine the 5mge mounts with the 22r mounts.
Anyways I am lazy hey I admit it so the less fabrication required in a motor swap I am all for it.
Also they are only 40lbs heaiver than the 22r. Which isn't that bad.

Also the CR is low enough on some of these motor you can turbo them fairly easily stock.
Here's a article on how to turbo one using parts from a 7mgte motor.

http://geocities.com/aarongarney/5mgte.html