but that shouldn't be the only consideration. If the cyl's have good compression then there's no reason to open a can of worms. While it's out replace all the peripherils like Turbos, rubber hoses, knock sensor. Pull the plenum and replace the valve cover gaskets and do the coolant bypass while it's off. Take care of power steering hoses and inspect the rack for leaks. Best time ever to take care of that. And YES!! the EFI harness. With the Wiring Specialties harnesses now readily available that and your turbos should be 1 & 2 on the list. Good Luck