My advice to you would be to drive the wheels off the car and then junk it. Sorry, but the 220D is not much of a car. It was the absolute bottom of the Mercedes line in the '70's. Limited options, little trim package and it had to have been the lowest powered sedan on the road.

A pristine example would be nice, a good condition car with a weak engine acceptable but a car which is basically an engine stand? Nah, drive it until you find a decent 240D or 300D.

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