Power steering.

Thinking about getting a ex mod 90.
I have a scrap disco 300tdi with a knackered engine and was wondering if the power steering system could be swapped over onto the 90 ??? Would all the parts fit or would i be better off sourcing all the parts from a 90?. Also was wondering if the transfer box from the disco(an automatic) would be a straight swap to give me higher gearing and a bit more cruising speed?
Gary.

if fitting to a 2.5 na diesel t/box would be too higher geared power steering would fit vehicle but you would need the bracket for alt/pas pump and 2 or 3 groove crank pulley

Ok thanks for the advise.