Congratulations on the MB.
Post some pics when you get a chance. You definitely got a good deal for $250.
Try running your VIN# through this site:
http://old.mbclub.ru/mb/vin/?lng=eng
It will give you the options list and your engine and trans numbers.
Have fun with the valve adjustment. A little RTV on the new seal will help it to stay in place while trying to put the valve cover back on.
I also took a pic of everything before I started so I could have a reference for how all the stuff went back together. I've already had the linkage for the bowden cable messed up and was able to verify the correct way with the pic I took before hand.