putting a JDM motor in a USDM supra is very straigt forward. here's some tips for you:
1) drill out the metal pipe behind the head, as it is a JDM motor, their heater core feeds from the opposite side (where ours is blocked off). you should drill it out and attach a NEW hose for the drivers side heater core there, and block off the part thats blocked off on the USDM motors.
2) you'll need to swap a FEW of the connectors for your USDM connectors. if i remember correctly, they're all 1-wire connectors, so it's pretty easy. make sure you SOLDER them, and shrink wrap them to prevent corrosion.
3) as with any motorswap in the supra, be very careful not to crush the passenger side heater core outlet. it's only copper and will crush very easily, making a heater core leak inside the cab. not fun
.
4) it's much easier to pull the engine and tranny TOGETHER. this way when you drop the assembly back in, it follows the natural contour of the tranny tunnel. i will never pull a 7m without the tranny attached.
thats all i can think of right now. i just woke up a little while ago... damn night job.
-shaeff