I would be surprised if it is a 9"... possible, but they stopped being fitted to trucks in the early 80's.
The oil leak will just be the seal.

Front suspension is usually lifted by longer springs or by placing a spacer where the spring mounts (for coil springs).

The 2" block at the rear is standard.
No idea on the power steering box - its distinctly possible its out of a falcon of similar vintage, and not the box from the states, I haven't had a great deal to do with effies of your vintage.