2.2 sfi motor swap to ecotech?

i have a 2002 cavalier with an 2.2 sfi and i was wondering other than swapin out my computer. would i need to switch out my harness to

You would have to swap out the harness and the trans.  The easiest way to do the swap is get the whole cradel for the ecotec.  Then replace the wiring harness while the motor is out.