an OT power steering question...

[surfacerust]

I know this is an off topic vehicle, but at least it isnt a f*rd.

So... ive got a 66 impala station wagon in the garage ive been working on for a while, when it showed up the lines were off of the steering box.
i took the lines off of the factory pump that was locked up and put them on a mid 70s truck pump. and now i cant figure out which line goes where
i assume the high pressure line is the "in" and the low pressure (the one with just the hose clamps on it) is the return.

there are two ports on the steering box both on top. one onthe inside and one on the outside...
which one goes where? im afraid of either blowing lines or damaging some equipment, times are tight you know?