Standard vs. Reverse Rotation steering box?

Im putting power steering on my 77 2wd Dodge truck. All of the steering boxes I see are for reverse or standard rotation. My pitman arm nut faces down. What do I need and can I use the manual pitman arm on the power box?

You want the standard rotation steering box. The reverse rotation boxes are for 4wd and have the sector shaft come out the side. I think the 4wd boxes switched to standard rotation around '78ish. I believe all 2wd boxes were standard rotation. Not sure if the pitman arm will interchange or not, between manual vs power steering boxes.

Ok thanks!