Longgone got it good in frame 6. Suggest that when tires are off, check the wheelwells for any rubbing. A-bodies are notorious for not being "true", especially rear ends being off-centered. Completely agree that bushings and ball joints be replace before alignment. Get the basics to work right, first.
Was the car originally a 360 car? You may want to clean off a section of each of the torsion bars and put a micrometer to them. First, they should be installed on the correct side. Check rear of bar for L/R marking. There may be too much crud and not enough light for you to see it. Second, the bars should be .870 in diameter.
Both torsion bars and leaf springs tend to be self damping which can make using the bounce on the bumper test a poor way to identify bad shocks. If you pull a shock off and can extend and compress it easily with your hands, it's shot. There should be considerable resistance and unless you are a gorilla, you should have a great deal of trouble compressing a gas shock.
Manual steering is fun above 20 mph. Parallel parking with manual steering is good exercise and will make you sweat like any good exercise should. Factory manual steering has better road feel at speed but is slower than power steering. There are kits to speed up a manual box, but look for effort to increase further.