The 87 190E is fuel injected. That is what the "E" is for in the designation 190E. So the carb part of your question does not apply. Seems to me that the swap should not be too difficult, although you will probably have to switch the electronics and possibly the main wiring harness to do it. If you don't have the engine management computer of the 87 I think you better start looking for one.

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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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