( I have copied this from the forum in order to capture the details into the main site and preserve it into the future, thanks to Dave cc for writing in - Martin)
I have started to get an engine ready to go into Blue Jim so I thought would start a step by step guide into what you need to do in case any others fancy going the same route....
Izuzu Engine out (from Astra). Take all the ancillaries, header tank, starter motor, altenator and as may hoses as you can grab. If its an early type altenator then you will also need charge relay located in the drivers side kick panel. Do not bother with the glow plug relay as its a arse to get to and a sod to get working. Use a Pug 106 unit that you can get for a tenner and which are far easier to wire in. Also do not bother with the Astra radiator, you will need a 300tdi discovery unit.
Remove tin manifold covers.
Turning the turbo housing to point north.
Unbolt manifold and all the rest of the pipes. Remove manifold, unbolt actuator and housing. If its a Garret turbo you can simply turn housing to point north and put bolts back in. If its an IHI then you can only get 1 of the 5 bolts in, the others wont line up. Therefore you will need to drill and tap 4 holes M5 and idealy replace the Torx screws with allen bolts.
As you can see from the picture the compressor housing points downwards and if not rotated gets in the way of just about everything