[flatbed67]

Thank you, Getter-Done.
Honestly, I don't know if I have any sunvisors in my truck, I never gave it any thought.
The reason for this, of course, is that I never really drove it. The engine started and ran, so I drove it a hundred yards down to the road and back with no working brakes at all.
The last time I started the original engine, I happened to have one of the valve covers off, and noticed that one rocker didn't move at all. Holding it with my fingers while the engine ran, I could feel some remnants of a cam lobe.
So next up will be changing to another engine.
No use trying to do a simple and easy engine overhaul on an engine that has a whole cam lobe ground down in the lubricating oil. All bearing surfaces must be in a real bad condition.