Odd Suspension Issue "Fixed" Itself

Similar problem here. Putting together '71 Valiant for my son and every time I jack front end off the ground by frame and then set it down, the front end stays up at least 3" over normal height. Jouncing front of car does not change ride height. Car must be driven, with several turns, in order for front to settle down. Kept thinking previous owner or front end guy possibly tightened upper control arm bushings with weight off suspension ( has newer QA1 upper arms). We set ride height for best camber setting (eyeball), and adjusted toe so we could drive it for first time over the weekend. After one day of driving, front end alignment completely changed itself. Checked everything Monday and found lower control arm bushings shot. All makes sense now.