Factory ride height rear end 71 swinger

Get a spirit level 4ft. long and set on the rocker ..this will tell you if car is level . do not guess at this . If you have replaced the rear spring bushings just snug up the bolts , do not tighten them . torque them only when car is on the ground and weight is totally on the tires . As tmm says , everything you put in the car changes the ride height . I would go so far as to jounce the springs a few times b4 tightening the bolts . Just so your not in a bind . JMO