Some more small tasks done.
Yesterday, I changed the rear differential oil - which looked / smelled old, but not completely foul. The new Redline 75W90NS made a small difference when I took the car out for a test run. Another job done.
I also spent about an hour cleaning the interior & conditioning the leather. It takes a lot of elbow grease to remove the years of dirt and dust!
The car, and most noticeably the engine, is starting to loosen up as I put more miles on it. When leaving from a standing start, there is an occasional 'klunk' coming from the rear end. So it looks like I'm going to need to track down a worn bushing...