You don't happen to have the maintenance records, do you? If not and the PO had the car serviced at the dealership, you may be able to retrieve what has been done from them. Absent that ulflei is right; a complete fluid change is just good insurance. This includes brake fluid, coolant, transmission fluid (and filter), oil (and filter) and have the differential checked. Over 30 years things go bad from age.
A very low mileage car like this one is a mixed blessing unless the PO saw that it was driven (even if just a bit) on a regular basis. Seals and gaskets get brittle, hydraulic gymwidgets freeze, and so on. While you're at it, change all the air filters (including the cabin filter).
You have an uncommon acquisition that is worth the few hundred dollars all this fluid and filter changing will cost. Over time you'll probably have to spray the electrical contacts with CRC or something like it to get all the electrical things back to snuff.
It may or may not need spark plugs; pull one or two and have a look.
Your car is an R107 chassis. There is a forum on this site just for that chassis and it is filled with people who own versions of the car you have bought. They will be your friends when things need fixing. There is also a place called Adsit (http://adsit.com--I
think) that sells all manner of body and interior parts for this car either used, new, or NOS. They will save you a fortune when you're looking for parts.
The R107 is a pretty study vehicle. If it has been maintained fairly well over its life, you should get a lot of use from it without spending two or three fortunes keeping it on the road.
If you would take time to fill out your profile ("quick links" at the top of the page--pull down and click "edit profile") there may be suggestions for wrecking yards and mechanics in your area.