Let's say you're faced with an engine that has had a bad cam shaft and lifter problems (threw a rod once) and now has stainless steel in the oil filter and you're not quite sure what's going on but the engine only has 1400 hours and you're beginning to suspect that it's just a bad engine that chews up cam shafts. It's just one thing after another. Do you rebuild? Swap out? Buy New? Does anyone have any idea about the NET cost of these options for a Lycoming IO-360 on an M20J (i.e. after trading in the existing motor which can probably be rebuilt depending on what's wrong with it, and nobody really knows yet what's wrong?)