1967 Dart stiff steering after replacing Idler Arm

Just replaced the idler arm and now the steering will not return back to center. The arm is the same dimensions as the old one. It only goes in one way. Might be that the caster was off before and the tight idler is exacerbating the lack of return.

It is possible that the toe is off, now that the slop is gone. Ill be lifting the front to see if there is any resistance anywhere tomorrow.

Any thoughts?