98ContourSVT,
You are obviously doing some homework here. One other thing to really consider is the build level of the engine. Swapping and cleaning parts like oil pans, rocker covers, front covers takes time and translates into increased labor costs versus a more complete engine. Also, small parts like new spark plugs, oil filter, oil pan gasket, valve cover gaskets, intake gaskets, exhaust gaskets, and front cover gaskets will bring up the costs quickly with the service counter mark-up. The above can make a more complete engine not as expensive as you think.
