The pump is attached to the front of the engine with brackets. I think you mean the steering gear box.
I replaced my gear box while i had the motor out.
But if you have the stock exhaust manifolds you should be able to do it with out moving the motor, that's how my bother did his. (72 duster 318 )
You will need room to move it up, forwards, back, and a little to the sides.
With my TTI headers there is no room so i would have to move the headers around.
Maybe If you have pics of your bay others can see if you have room.
Do you have headers or stock manifold?