figure about 10 hours to remove the old engine and replace with a used engine (assuming that the used engine comes complete with everything so that you don't have to transfer parts).

So the approximate cost would be the cost of the used engine plus 10 hrs of labor.

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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/showthread.php?t=112321
2000 BMW 740IL
2000 Integra Type R - Track Car - SOLD
2005 S2000 - Track Car
06 C230 Sport
89 560SL