lean on these cars is common, can be anything from a bent frame/subframe mount area to bad body bushings or springs installed wrong. if you said you replaced everything i assume you installed them right & replaced the body bushings.
i had a car that had been abused or maybe even jumped like the bandit or dukes of hazzard & it bent the floor area where the rear subframe bushings mounted, i had to use some washers as shims to get it straight.
aside from physical damage, you might want to check the install of the rear springs, make sure they are lined up with the holes in the shock plates & tightened evenly. also check front end links, they can pull the car down if over or unevenly tightened. best of luck figuring it out.