Ok. I think I see where the description starts. I assumed the "I don't work on MB" could not possibly be something you yourself wrote.
So to boil down the seller description:
- tried to get fuel system working correctly and failed. Fuel system still isn't right. Might have even bastardized the system with incorrect parts.
- expensive 6.9 suspension system is not working and you should plan on replacing the entire system, whether with original ($$$$) or springs (huge loss in collector value).
- AC does not work.
- it has some rust (added by you).
- What year is the car?
- North American big ass bumpers, ugly headlights, and less power? Or Euro?
- will it need paint too?
This car sounds like a mess from the description. For me (to understand my bias) a running, driving euro 6.9 has some serious appeal, but it would still have to be near free for me to buy one. I have no love for North American park bench bumper Benzes, and would avoid most cars with Chrysler climate control. So the only reason I would buy one would be to part it out, scrap metal the bumpers, and rid to world of one if the big bumper cars that I believe are the whole reason all 70s-80s benzes are so cheap in the US. Now, a 6.3 would be a whole different story, even a euro 6.9 tugs at my heart strings.
Edit: I forgot to make sure my tone doesn't sound so negative. :-)
I have been told by someone who has owned both. The 6.9 is a much finer machine than the 6.3, which is basically a hot-rodded w109.