with the experience of my previous conversion on a LR series 3, a electric pump is out question, so a mechanical as to be fitted.
I knew that the old, 2 door Range Rover from the 70s had power steering, so the search began for the power steering pump from one of those cars + the bracket for it , and the crackshaft pulley for the same engine.
this picture I found online, showed what I was looking for :
First job, turn the distributor 180º , since the vacuum advance is the oposite way from the one on the picture above : before :
the pump itself was a straight forward affair.
The bracket for the pump :
In place :
next step , modify the crankshaft pulley tho accept a second pulley.