There's no right answer to this one, only the right answer for you and your circumstances. My opinion is put a new MB long engine in it and replace the ancillaries while you're at it but the value of the car to me far exceeds "book value" so I don't care. If I felt differently about the car I would absolutely go to the PNP and grab a used ending for $350 and roll the dice and not look back.

One thing though, you know the odometers start slipping so who knows what the mileage really is on a used engine.

Bottom line: This is a question only you can answer.

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'83 240D