Steering box help

I have a 67 Barracuda with power steering. I'm putting a Saginaw pump on. My question is...which fitting on top of the box is the high pressure? I assume the barbed fitting on the front is the return? I need to put a -6AN fitting on the high pressure port. If it's the rear inverted flare port, what is the fitting size that goes in the box? 1/2" 20??? Thanks if you know, or correct me if I'm wrong.