Torsion bars!!!

I run 1.12" torsion bars (300 lb/in) on my '74 Duster- small block, iron heads, aluminum radiator, manual steering, no AC, with Hellwig sway bars front (1.125") and rear (7/8"). While the car is set up for autoX, it's also my daily driver and primary mode of transportation and has been for several years and over 20k miles now.

I also ran 1.12" torsion bars (270 lb/in) on my '72 Challenger- small block, iron heads, OE radiator, power steering, no sway bars. It was my daily driver for about 8 years and over 70k street driven miles.

If the primary use of your car is on the street, the 1.03" bars from PST will be great. Wheel rate on those is ~230 lb/in. They should be used with high quality shocks intended for large torsion bars- Bilsteins or Hotchkis Fox shocks. Do that and you should find that the car both handles and rides pretty well. Not ideal for strip only use, but really you're not going to be losing much time compared to the benefits you'll see from improved handling everywhere else.

I did run my Duster around with 1" bars from Just Suspension (~200 lb/in) for awhile, and without a sway bar I found the car still suffered from a decent amount of body roll. And that was just with 225/60/15 Falken Ziex's on 15x7" cop wheels, nothing fancy. The ride was still way too soft for me, which is why I went up to 1.12's. I wouldn't recommend those to you since you're not looking for a corner carver, but even those matched with the correct shocks aren't as bad as people make them out to be. The 1.03" bars are a good all around torsion bar for street use.