Unsymmetrical steering issue

I don't know about '63 Darts, but my 67 Barracuda is keyed for the steering wheel and the steerring box coupler to only go on in one position. If you have separated the pot connector on the steering coupler, it IS possible for it to be off, but only by 180 degrees.

When I did mine last fall, I verified that my steering box was centered and the wheel was centered. The pitman arm on mine was keyed every 90 degrees, but it would be very obvious if you didn't have it on the correct key. Once you have the Pitman arm in the right location, set the centerlink in place on the pitman arm and idler arm. Then move to the tie rod assemblies. Both tie rod assemblies on mine were the same length (13" if I remember correctly). Mine were very close to dropping into the centerlink and the arm on the lower balljoints, with only minor adjustment needed.

If things aren't matching up after all that,.... Is it possible you have the centerlink on backwards or possibly the wrong one?