Well, I bought it: 1991 300SE. 188,000k on the odometer.

Wow, that really concerns me to hear about the head gaskets. I had to do a head gasket replacement on an '87 Cadillac DeVille and it was NOT FUN; probably owing to the fact the the GM HT4100 is the worst engine ever designed...or rather, not designed (since "design" tends to suggest some semblance of mindful effort).

Now I'm fearful that maybe I shouldn't take it on a long road trip as I had been planning...