For just a 1" drop, tall lower ball joints.
Will improve handling and bumpsteer and have zero effect on ride/suspension travel. The only mod needed is to cut clearance in the brake dust shields.
An Fbody hollow front sway bar, Cutlass jounce bars, a pro touring style rear sway bar and if the car isn't rusty, replace the just the lower missing body bushings with actual bushings.
Keep in mind a tall lower ball joint will lower the ride height in the front by .5" You will have to make this up with spring shims or something if you want the car to sit level.
Tall ball joints don't always 100% fix bump steer issues. It can be a general rule of thumb when you lower a car it will help correct it but to actuaully correct it you probably need a bump steer kit.
Craig