64 A body Handling question

I'd start with the basics, know that all of the bushings are good (including those in the rear springs) or rebuild the suspension. I would NOT go with urethane bushings. They are NOT better than rubber, they are merely stiffer. Which sounds like a good idea for the use until you factor in their negatives. See the poll thread on them.

Next, put on a set of good shocks. I call KYB's the very bottom end of those, and anything else that you can get from most normal parts houses not even in the same category. Fox, Bilstein, likely QA1 (no experience with them), etc. are better than the KYB's.

You know how drag racing is all about the engine tune? Off Road & road racing is all about the suspension tune. I can not over-state how important good shocks are to good handling on any surface, they are at the core of the tune on the suspension. If the budget says one thing at a time I'd go with shocks first. Then the sway-bar. Then maybe step up the t-bar size if you feel that it's needed. I'm not in the "stiffer t-bars = better handling" camp. A compliant suspension will out-handle one that is too stiff even though the too stiff suspension has better front end geometry. If the tire can't track the road surface variations then you'll lose traction every time the tire unloads or even comes off the ground.