Manual steering boxes were left natural...PS boxes were painted black. The paint was cheap and didn't last long. That's why a lot of people think their PS boxes were natural.
K-member is black. It was probably gloss when new but the paint was so cheap it didn't have a lot of shine. I had my K powder coated in a semi-gloss black. I can't remember now if it was 60% or 80% gloss. It looks good and will hold up much better then paint.
Torsion bars are gloss black. I've heard of people powder coating them but I was afraid of the coating flaking off. I just set the bars accross two saw horses and sprayed them heavily with gloss black Rustoleum. I set them in the garage for a few weeks to dry before installing them. My HD bars had silver paint markings on them.
I used RPM on the tie rods, adjusters, center link, spindles, pitman/idler arms, calipers, strut rods and leaf springs. So far everything is holding up great. I had planned to darken the front sway bar and leave it natural but the powder coater sprayed it black by mistake.
Disc brake dust shields were painted black from 70-72. They were galvinized in 73-74.