Inspect the lower control arms for hairline cracks before replacing bushings. The LCA supports the front end weight of the vehicle in our case (and some other GMs) and can fatigue over time.

If you do find a crack, it's best to replace them. If you're not concerned about originality there are several aftermarket LCAs that add more positive caster for improved straight line tracking as well as some cornering benefits. Will slightly increase steering effort, but as long as you have power steering that's actually an improvement (ours are very overboosted IMO).