My question to you is this: Do you really NEED this? I mean, come on. A car is a car. A truck is a truck. One accident is all it takes to make all of that pretty metal turn into a worthless piece of junk. I would say, go with a car that functions, looks pleasing to the eye, and doesn't cost so much that you will have to sell your body parts on the black market to afford it. Common sense is required, especially in these economic times.
EDIT-
Don't buy a separate engine. Just get a truck. Or a car. Don't buy piece by piece. Save your money for important things, like gas.