Nice motor, and I hat eto burst your bubble, but.........
That engine swap is no where near as simple as it seems.
Engine wiring, but hope you got this with the engine, if the donor car had cruise control, this again will be a huge problem. The throttle body has a seperate loom if fitted with cruise, but if without cruise the loom would be attached to the wiring harness.
4sp\5sp gearbox, if going from one 2 the other an additional wiring loom and control unit are required, the drive shafts and diff will need to be changed.
Inboard wiring harness, thats the other plug that goes onto the ecu.
This inboard harness will be the biggest problem. It routes onto all components in the engine bay, except the engine, goes under the blower box, into the fuse box, then into the dashboard. It can be removed and changed over, but its not easy job.
Plus your car and the donor car must match in the following respect if you wish to change the inboard harness over:
Cruise or not
Aircon (factory fitted not after market) or not
4sp or 5sp
If you have any more questions or need advice, ill be more than happy to help. IMO, if you want a e320 your better off buying one and swapping your body kit over.