mikeclass06

i have a 97 v6 5 speed. i recently bought a 02 v8 cobra that had been rearended and i purchased for 800 dollars. im about to swap out motors and am just wanting to make sure what all i need to swap. or what is the easiest way to do. i know computer harness and motor. my real question is about the wiring harness and wether or not i need to full pull dash out and swap ALL wires under the dash or is the engine computer harness stand alone from the wiring under the dash that run to electronics inside? if u could help it would be much appreciated