(More advice from someone who hasn't done it!) The easiest will be to replace with the same type; then engines that have been factory fitted in the same / similar chassis - the OM617 falls into this category but it is the little things that will bite you in the arse...
...an alternative that hasn't been mentioned in this thread at least is to replace the engine and transmission with something that is locally available and considered to be reliable => in your case that might be an American V6 or V8?
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