Hi kk,
I suspect it is just worn/rotten rubbers, the car has done 73,000miles but the rubbers have done 33 years, I haven't given up yet, the ball joints are all good, the steering box has play in it. So I have ordered but will be a while before I get them, FF up control arms with the extra caster, new bottom arm bushes, torsion bar bushes. FF have said the arms will allow for up to 5 degrees caster. The bushes are urethane type (that hardish plastic stuff) Also the solid aluminium body amounts along with a steering gear I have had rebuilt here with bearings fitted and heavy feel to it. I am hoping once all this is done the car will drive much better, its going to take time, so will keep you posted on progress.
SAI also known as kingpin inclination, its where you draw are line through the top and bottom ball joints and where it hits on the road is the angle, it changes when you change your wheels to different widths, no one can really tell me what it does, but its something that is designed into the car, some one else may know more, have we got a wheel alignment tech in the forum?
See You
Bruce