I have an M180 engine out of a 1968 230S for sale. I haven't run it, but it ran when the car was parked 25 years ago (for a transmission rebuild that never happened). The engine is complete from the air cleaner to the oil pan, with the starter, alternator, distributor, and power steering pump. I believe it has a pulley for a York A/C compressor on the front as well.
The head was "converted" from a direct injection gas 2.3 by plugging the supply line for the injectors with a pipe plug, so this engine also has the injectors for GDI.
I'm thinking $300 OBO, buyer pays shipping. You can contact me in this thread, via PM, or at arootbeer at gmail dot com.
-Matt