The reality of installing the 2GR is almost there.
There are a few mods required if you wish to do this. Cutting some aspects of the V6 block is required for fitment of the E153. Unfortunately the engine number is partially removed to allow for the clutch slave cylinder. Some more filing is required for the gearbox install.
Unless you wish to have bungs welded on a Gen 2 bellhousing, you will need the Gen 3 housing. The Camry gearbox has a different diff housing which does not allow the use of the MR2 bracket. If this is the only gearbox available you will need to modify the rear gearbox housing so it attaches to the gearbox in a decent manner. A TIG welder will be required.
If you are interested in making your own exhaust manifold, Liverpool exhaust now has the 2GR flange with holes to suit 1 7/8" pipe. These are inserted then welded but simply butt welded to the flange. $100 per set.