3 Lines on Power Steering Pump?

[b2948kevin]

Hey guys, I am currently upgrading to power steering on my 66 long step, and I have everything in (pics and write up to come soon on my build thread), but I am confused about what to do with the lines. I have one port for high pressure coming out of the back of the pump, and 2 low pressure nipples also. The pump and brackets came with my engine, a 350 one piece rear main, not sure of the year. Can I just plug one of these?

Here's a pic of the pump that I'm dealing with:

http://www.ebay.com/itm/CHEVY-GMC-TR...40b1f6&vxp=mtr