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im most computer controlled engines, there is a seperate engine harness from the underhood harness. i know thats how its in in MOST car, but i have dealt with an 86? iroc that had the harnesses mixed, but theres still one main part that can be removed. With gauge wiring on your 84, it is all in the underhood side of the harness, and not through the computer. To remove the computer harness, first remove the computer from over the passenger footwell and unhook the harness and pull it up through the fender and into the engine compartment, pass the blower motor. That main harness now can be unplugged at one connector at a time. Fans will not function as stock however, they are usually computer controlled. radio, lights and wipers will eb completely unaffected as long as the main power wires off the starter are left intact. Once the motor is out and you can easily access the engine compartment, youll get a better idea of what can be removed, obviously try to label connectors when you pull the motor. You may have to remove some factroy wiring loom the seperate all the wires and seperate harnesses. most of the vacuum lines can be removed, main ones youd need are to brake booster, vacuum canister, pcv, dist. advance(if used) and climate control system. The T5 setup you are using, is it mechanical or hydraulic clutch setup? i ask because if its a hydraulic version with the tilted belllhousing, the Long tube headers will interfere with the clutch slave cylinder.(the manual linkage clutch may also have clearence issues, but i dont know) I may have missed a few thiongs with the wiring that may be year specific(82-84) but overall thats basic stuff for the later 3rd gens that ive worked on/dissassembled.
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