Did you look over the picture Tony linked you of the steering pump from Autozone, on the first page of this thread????
You say the leak is coming from behind the pump? You say the pump isn't leaking steering fluid, so to me it means the cover seal is leaking or as someone mentioned earlier the leak could be from the PCV breather between the heads and oil is running down the vee of the timing cover by the power steering pulley.

Questions for you????

When where the head gaskets changed, mileage since?

Did the person put RTV in the critical areas the manual calls for?

Are you using the car now?

Do you realize your crank pulley is no good?