Roughly, it's not worth more than a similar model in good running shape MINUS the cost of a good used complete running engine MINUS what a competent local shop would charge to do the swap MINUS some amount for the overall hassle and understanding that it can't be road tested for critical things like brakes, steering, suspension, transmission, even A/C operation.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.