Anything you swap with fuel injection you will need the donor computer.
Small block Chevy's seem to be a popular swap and there is alot of information on it. You can get into thousands of dollars with this swap according to what needs to be done to the new motor and how much you can yourself.
4.0L Jeep engine is a good swap. Stroke it out and you get twice the power and torque from it. Plus it will blt into a Jeep with no problem. Again this swap can run into the thousands of dollars according to how much you can do.
With any swap you will need to get a new transmission, new motor mounts IMO, new cooling (radiator), sometimes new alternator for more output, and new exhuast.
