I’ve completed restorations on many of these cars over the years and one of the best things you can do to make these cars drive well and retain a “stock-ish” appearance is to replace all the rubber bushings front and rear. I use high quality stock replacements for a restoration, and upgrade to urethane for performance or the resto-mod look. I don’t like poly, they can squeak and can make for a “hard” ride but use a good quality lubricant and check with the poly manufacturer to make sure the lubricant will not deteriorate the bushings. Adding a front sway bar and/or replacing the small stock one also makes a huge difference and a rear one makes it even better. For the money and time invested it pays huge dividends. I usually add new springs also and quality shocks goes without saying. These cars are old and heavy and need some love to improve that driving experience.
Good advice. After I put the 9" under there the car drove one hell of a lot better. The bushings....