Suspension advice

Make sure the stuff that's there works properly, first. Otherwise, you'll just be chasing problems around (if there are any). I agree that replacing worn front end bushings and a good set of shocks is a good start. Replacing the bushings with polygraphite will make things a bit more precise, but they are prone to squeak. (I have not had the problem personally, but others on the board have.) Recommend a gas charged shock absorber.

I like adding a rear bar. Most aftermarket bars mount on the rear axle which adds to unsprung weight making the car ride a little rougher. They work fine nonetheless. For the Demon, I fabricated mounts to put the bar on the body, which makes the weight of the bar part of the sprung weight of the car.

Nothing will transform a car's handling more than a good set of tires. Here's where things get problematic (also, expensive) for A-bodies. A good performance tire likes a lot of rim width. Only disk brake cars made after 1972 escape the curse of the small bolt pattern (SBP) wheel. These two things work against each other. Mopar's 14 inch wheels for the A-body were either 4½ or 5½ wide. (The wheel centers were also notoriously flexible.) This is not conducive to high performance from the tires. The good news is that the wheel wells will take a 7" wide rim with 4¼ or 4½ inches of back space without problems.

As far as tire sizing is concerned, getting things to work up front without interference is the issue. I've got 235/60-15s on the front of 72 Demon using Mopar cop car wheels that are 7" wide with 4½ of back spacing. Ride height is set to the minimum within the recommended range. I can drive aggressively on smooth roads without any rubbing. This is the maximum front tire size I'd recommend.

In the current situation, you're limited in choice of aftermarket wheels to Cragar s/s or Wheel Vintiques SBP Rallye wheel reproductions. Not sure about the Cragars, but the WVs can be had in 14 and 15 inch diameters for the SBP Mopar. Back in the day, I think, Ansen Sprints were made in wide widths with SBP.

Nice looking Dart in your avatar. Good luck.