66 C10 new power steering not working

[Tom66C10]

Hello,

I installed power steering on my 66 C10 using all new parts for a 70 C10. The steering wouldn't work, and it would push fluid out the top even with cap on. I assumed the new pump was bad, so I went to Advance Auto Parts and got another one. It is still doing the same thing. I jacked the truck up, and turned lock to lock many times, and no power steering still, and still pushing fluid through cap. All of the parts are Cardone, Moog, etc, so all stock replacement parts.

Any ideas?

Thank you

Tom