Oh man, Steering problem

Ok fellas I have a problem and I know one of you can help me.
I will try to make a long story short. 71 Dart 318 power steering.It had a federal pump on it that was leaking really bad. I decided to switch from the federal style to the Saginaw style and use the March mounting kit. This turned out to be quite an ordeal. Because of this it created a hose nightmare. What I ended up doing was going to the pick a part junk yard and found a 86 Chrysler 5th Ave. The pump, mounting brackets,steering box are the same as the Darts. So figure I will take the pump hoses and for good measure the piece that the hose mounts to on the steering box. I get everything back to the house and start compairing all the parts. Everything is exactly the same except the hose mounting for the steering box. I thought no big deal. I will simply replace that house mounting valve assembly on the steering box and everything should be fine. When I replaced that valve assembly I was very careful not to move that spring Pin thing that is in the steering box that fits into the valve assembly. If you have taken one apart you know what I am talking about. I put everything back together and started the car. As soon as I did the steering wheel ripped out of my hands and went hard left very fast. I have taken the valve off the steering box several time and doubled checked everything and it all looks and measures the same including the slide valve.

What is causing the wheel to turm so fast and so hard?