So I finally solved the scraping steering column noise. Turns out the contact ring for the horn circuit was rubbing wrong and had worn poorly. I block sanded the surface of the ring with 800, 1000, 1500, and 2000 grit sandpaper back to a nice smooth surface then lubricated everything with dielectric grease and now it is silent.
In the process I also purchased a Mitch Leland steering column bushing as I thought this might be the source of the noise (which it wasn't) but I do think it helped firm up the steering response and overall feeling so for $30 it was well worth the money. Apparently the PO's mechanic had installed a metal bushing that was starting to wear and had more play in it, so I removed that and installed the ML unit for an improved feel.
I also decided to re-stitch my steering wheel as the leather is in relatively good shape but the stitching had deteriorated and left most of the leather loose on the wheel. Took a LOT of time, partially because I was learning partially because it is just a slow process but I probably invested close to 8hrs into the project.
Now the car is resting peacefully in the garage with the motorcycles. Today was crazy nice weather in the PNW so it's bike season for the next while.
