I know there are people who know exactly when what models were produced and I don't but I was looking at this website and according to it, the 530 wasn't produced til 94. Maybe this is America.
http://www.bmw4life.com/e34History.htm
Have you emailed the owner for more info? I don't see mileage in the listing. If you want, I will private message you the 25 questions I asked the prior owner of my car before looking at it. Can you look at the car and get a sense of whether it is just the bent valve stem or lots of other stuff? I would want a sense of its overall maintenance and you can't get it from that ad.
By the way, something similar happened to my car when it belonged to its prior owner. He had an indy repair it. So I guess it happens.
Pyro got his car for $1200 cause it was a project car. You might want to find whether he and others who buy cars that don't run and fix it themselves would do it over again knowing what they know now. Do you really have the time and patience for this?
Dinan chip, Bilstein sports w H&R, RD sways, RD strut brace, 750 bushings, Zimmermans/MetalMasters, O.E. M Pars, Eisenmann muffler