Off to a great start, doing the right stuff!
One quick job I would add to your list is replacing the body to frame bolts. They tend to rot out. When I picked up my 1977 Trillium
, there was almost NOTHING holding the body to the frame. I got very lucky!
There was also a recall on the frame around 1976. Before then, the front body to frame bolts were drilled through the frame rails, right at the point the frame was bent inward. This lead to the frame breaking/cracking at this point.
The lower square "washer" in my top picture is not a washer at all. It was all that remained of the angle clip that was welded to the side of the frame rails. So there was nothing holding the front bolts to the frame. The other bolts all looked like the bottom picture. I call these "easy to remove" bolts. I put a wrench on the nut, and within about 1/8 of a turn, the bolts all snapped.Pried the top section up from the top, and reused the original square plates.