Too old and can't be aligned sounds to me like they just don't want to work on your car.

Without seeing the car I have no way of knowing but yah bushings probably. Your shocks could be shot. I am somone who has changed shocks and its not somthing I would wish on anyone. A lot of times the nuts on the top of the shocks are siezed meaning you have to cut them off. Then you need a spring compreser the whole thing is just a PIA. But ya does your front end look like its low? even though its never been lowered? That shock sag. Does your car making squeaking noises when you go over bumps? If it has been lowered did you also get adjustable control arms. If you lowered it you need the control arms, and you could need shocks and bushings. You also may have sagging springs.
My advice get some coil overs, or change your shocks and springs. Replace the bushings. If its been lowered get the control arms. The take it to another shop that is reputable and knows what they are doing. This is a common problem on z32s. Very Very common,.
