I'm starting to wander if the 200tdi conversion is such a great idea, after reading about the problems with the crank pulley fouling the front axle. When considering an engine conversion for a IIA be aware that a conversion designed for a SIII will not necessarily fit. This it true for fitting a Transit engine (been there done that) - the starter motor is in the position where the clutch slave cylinder goes on a IIA.
When I go greenlaning, people are surprised how well my SIII goes with it's Transit engine. It can keep up with 300tdi Discoveries fairly well on the road. If the engine had a sealed timing case and flywheel housing it would be a perfect conversion for a Series Land-Rover. I do worry about the timing belt snapping due to getting covered in **** when greenlaning but it has not happened yet in 3 years use, 15K miles and greenlaning on average probably once a month. I do get problems with mud getting into the starter motor via the flywheel housing which is a pain in the ass, but there are no clearance issues with the axle or propshaft.