5.3 swap into 68 gmc power steering pump question

[imsuchaman55]

I am trying to use the power steering pump that came on the 2001 5.3 gmc sierra engine, but am confused on how to connect it to my steering box. There are 3 lines coming out of the pump, one is the pressure line to the pump and the other 2 are connected to a power steering cooler. There doesn't seem to be a return line for me to hook my return from the box to the pump. Do I need a different power steering pump, or is there a way to make this one work?
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