QA1 K member (67-72) in a 74: Pitman arm hits torsion bar

By any chance, do you have a fast-rate arm? They are longer, and since they are mounted at an angle relative to the groundplane, they will travel upwards, lessening the clearance..
Check the length and compare it to the idler arm. They should be as good as the same length between the pivot points.
Also; has the steering box been shimmed for clearance?The two arms should be parking in the same plane,with the wheels pointed straight ahead. That is to say, with the front end on the ground, and the suspension relaxed, a measurement from the floor to the draglink, at the pivot points of the arms, should be approximately the same on each side(assuming the LCA inner pivots are also the same), and the link should be level from side to side. The LCA inner pivots have to at the same height irregardless.Your alignment guy should have balanced those.
If the arms are the same length, and the link does not sit level, or the arms are not parked in the same plane, I would assume the pitman is bent, and in my opinion, junk.As the car-owner,of course, you are free to heat it and bend it. Lots of people have done just that. I would not endorse it.