Help with 1971 dodge dart steering

The business I went to have it aligned I have never had an issue with them before and they came highly recommended. I fully agree that seems like if they cant center the steering they shouldn't do alignments. But embarrassingly enough I cant figure out what is wrong as they can't. I can take the pitman arm off and try to just center the steering wheel to the steering box. Well if I count turns left to right I get 3 and a half turns so I would think center would be 1 and 3\4 turns either way. Well if I do that then my steering wheel is turned almost 90 degrees to the left but if I center the steering wheel then it is just over 1 turn to the right and over two turns to the left. That's with out none of the steering attached that's just the steering wheel in relation to the gear box. When I bought the front end parts is there I different Pittman arm for my car maybe and I have the wrong one or when I had my gear some what apart to replace seals ro stop a leak could I have unknowingly moved something by accident?