I have a series 2 currently with a 3 bearing 2.25 diesel engine.
I have managed to get hold of a 2.25 5 bearing engine - What needs to be changed to make it fit?

Will the slave cylinder foul the Series 2 chassis?
 
As the slave is mounted on the gearbox it will not be moving unless you are going over to a series 3 gearbox as well.
 
The 5 bearing engine started transitioning to metric fittings, just be aware of that. In particular, the heater tap/takeoff at the front of the head could well be metric, it is on mine. Try and make sure it has one as they're hard to find. Various other bolts, studs and whatnot could also be metric.
 

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