Some people expressed interest in my other car, a ’71 280S (W108) that has gotten a OM617 and five-speed manual transplanted into. Here’s a few relevant pictures, they are not of the best quality but it’s quite hard to take decent pictures down in the engine compartment.
I bought the car this way, and haven’t done the conversion myself.
Close-up of the engine, two pictures. This is a OM617.910 (“240D 3.0”, NA), that was installed in W115 75-76-models. It has a more rounded intake manifold, as seen, and the oil filter housing is located differently than later OM617’s. Note that original air filter housing has been used, and radiator/oil cooler are also original.
Some of the pictures hints quite a lot of rust. Yes there are rust on visible spots, but the whole underbody is very clean and newly welded where needed. Also the interior is horrible, it’s missing pieces and seats are torn, I’m going to get a whole interior from a spare parts car and swap that in, whenever time permits.