I'm mildly curious, what are the most interesting engines that one can put into a 1983 W123 (240D) and not require a whole lot of custom fabrication?

I'd want a diesel, obviously -- but whether it's a Chinese diesel, a Force OM616a, or an OM603, or something else, doesn't really matter that much.

What engines from other cars have you shoved into your Mercedes? What are other things you've shoved a Mercedes engine into, that wasn't a Benz?

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER