Took me a while to get mine back on the road but I also did a lot of other stuff besides just the engine swap. I rode in a 200tdi powered 109 last fall at the Mid Atlantic LR Rally. I was very impressed, so were most of the other folks that saw it run. He showed up a lot of the coil sprung vehicles, but a good portion of that was driver skill too.
He had swapped out the turbo for a different smaller or lighter turbo that spooled up at lower rpms. Had a nice sound to it.