Quick question on pitman arm installing on new borgeson box

Real quick question and cant find the answer quickly, so I'm hoping someone can help.

Installing a brand new pitman arm on my brand new borgeson steering box. Nothing is marked, so should I assume that the box is centered when installing it?

I am trying to install everything on the kframe then bolt it up so, the steering column is not connected. I would rather install this now, but I guess I can wait until its in the car to install.

Any advice on the way to properly install this would be appreciated.

TIA