You might have a broken spring. I've seen springs that broke a coil or two from the lower end so the suspension doesn't collapse completely. The front ball joints are integral with the lower control arms so plan on new control arms if the ball joints are tired. Read up on recent experience with Febi brand products. They show positive feedback in the Pelican Parts store but more and more Febi labeled parts are made in China and from my standpoint there are more complaints of poor quality of late. But it's $200 for a Febi control arm (singular) vs $530 list. On the plus side new control arms come with bushings so you don't have to mess with hacking out the old bushings and purchasing and pressing in new ones.

Sixto
87 300D