just suspension 1.0 torsion bars. or bigger
hellwig sway bars, front & rear 1 1/8" front 3/4" rear
billstein RCD shocks.
upgrade to 11 3/4" factory rotors.
id use a good quality front end rebuild kit, or source all the parts from rockauto, using moog.
upgrade to a 17 inch tire/rim combo. 15's are about worthless now days.