"Pulls to the right" fix?

[Texas1971]

71 C-10 was a no engine, no upper a-arms and no springs sorta rolling chassis when I started bringing it back to life nearly 5 years ago. It's together now and I got that long awaited inspection sticker. It pulls to the right...I mean the steering wheel starts spinning if you let it go as soon as you start moving. I thought it might be the misalignment of the a-arms or something like that since I just "eyed it up" and bolted them in. But now I'm thinking it might be something in the steering gear box or a hydraulic problem. Your interest and recommendations are appreciated. Thanks, Scott.