you should get the harness anyways for the fuel injector plugs and stuff. when i did my swap we had an entire MPFI harness but it would be 10 times harder to swap out the entire engine harness than to just extend a couple wires and run a couple more for the fuel injectors. you should keep the MPFI harness around for plugs, and it also works great if you just need a piece of wire *hack* *hack*
