We have an 02' f350 with a 7.3 and want to replace 02 cab with an 06 cab with a v10. 06 cab is almost stripped out. Left with the wiring harness and the heater core. Do we have to take the 06 heater core out? What else needs to be removed between the dash and the fire wall to remove the wiring harness? Also are there any wires that can be shared between the 7.3 and the v10 so that we do not need to remove and then reinstall? Also are the vent systems the same?