What suspension parts are you running right now? Stock torsion bars and springs? Stock control arms and rubber bushings? What shocks?
All of that stuff makes a difference. Just adding sway bars shouldn't stiffen the ride quality a ton in a straight line, but they should reduce body roll and add to the overall spring rate when cornering.
The other thing is that a lot of cars sit lower than they did from the factory, and with the stock torsion bars up front that means the suspension is usually bottoming out. Guys mistake that for a stiff ride and don't want to use larger torsion bars. But upgrading to stiffer bars can actually improve the ride in many cases because it will eliminate the suspension bottoming out. These cars were massively undersprung in the front from the factory, especially if you're running radials because the original design was for bias ply's, which have a lot less grip. Aftermarket sway bars should help a bunch, but if you're still running all stock parts otherwise you may need to take it a step further.
