Best suspension for new restoration??

figure 1st what you want to do with your car. Better than average street cruising? Spirited twisty roads? Occasional Auto X?, Monthly Auto X & a couple road course track days a year?
I figure if Hotchkis can make a 4 door Satellite outperform a BMW on a road course, that's good enough for my Dart. You should also improve the chassis stiffness with something like the USCarTool kit. Plus, I wanted to keep my torsion bar suspension cause it’s different than what the other guys have.
For the next level of performance, you can look into Reilly Motorsports Alter-K-tion and Street Lynx packages,