Hey, you gotta give us more info man, if your gonna do a complete swap, then there is a lot you'll need depending on what car it is going in, which you need to tell us aswell. What engine are you putting in? What is the engine code? if your just gonna do a head swap you'll need the ECU for that engine, then you'll need to run wires from the head to the ecu (i can tell you the exact wires when you give more info). There isn't really that much you need, just hope you know what your doin.
-Aaron-