I will try that.The sound you're hearing could be some parts rubbing inside the steering column.
Since the steering box is bolted to the subframe and the column is bolted to the car body, changing the subframe bushings probably altered the positioning between the steering box & column. The rubber "rag joint" coupler between the box & column will take up some mis-alignment, but not a lot. So you might have a situation where the steering shaft is being pushed upward or pulled downward in the column just enough to cause some parts inside to rub.
If that's the case, the fix should be fairly simple. Just loosen (but don't remove) the 2 nuts that secure the steering column to the underside of the dash (they take a 9/16" socket if I remember correctly). The column hanger bracket has slotted holes at that location so you should be able to slide the column up or down as needed to relieve the pressure and stop the rubbing. Then re-tighten those 2 nuts. The plate where the column passes through the firewall will probably be flexible enough to allow this adjustment, but if not you might also have to loosen that up where it clamps onto the column.
You're right, the adjustment I described earlier will only move the column closer to or farther from the box, but not change the angle between the two. I suggested that adjustment because it's usually a pushing in or pulling out of the steering shaft in relation to the column that can cause things inside to rub.I will try that.
But loosing the clamp on firewall and 2 bolts under column will allow only to move column closer or further to the steering box but it will not change the angle/alignment of column to the steering box.