I concur. Depends on if the original underhood wiring harness is still there and if it's been tucked away "in case" you ever wanted to put the car back original...or if it was hacked on/ripped out in an attempt to "clean up underhood clutter". The harness alone can be bought new but it's pricey.
And also you will have to find a complete engine and trans with all the sensors and IC (if intercooled model) as well as exhaust.