[eightsandaces]

IMO, if you plan on changing the transmission too you are going to approach some sobering numbers on the finished product. First thing to consider might be selling your car as is if it runs decently and purchasing a newer low mile unit. If you're set on having the experience of building an engine (something I can totally relate to) then I would build one. A used engine is just placing another unknown into the mix, a rebuilt (at substantially higher cost) should be freshened to the point of dependability, frankly I'd keep the 5 speed and put the $ in the engine, especially given what comments I've read about the six speed..