When you do an engine swap you usually need to do a lot of modifications to many of the systems in the car. It is not just an engine swap. You will put more money into the car then you could ever sell it for, especially if you don't do a lot of the work yourself. From an economic point of view, if you want a car with more performance, go out and buy one. In my case I found a Lotus Esprit with a V-8 twin turbo.