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ok, im so lost here its scary..... alright... first off. by swapping the PCM(same as a ECU) to a lt1 version and using the v8 engine harness, you should have been good, the only real connections back to the body harness is for power and the diagnostic port. i honestly dont believe the BCM(body control module) cares if its a v6 or v8, i doubt they are engine specific. It seems the injectors loading up is a sign of them getting an improper signal and staying wide open, and you may soon hydrolock the engine. If the diagnostic hookup isnt workign properly start by getting that resolved and dont run the motor till you do, or you just run the risk of damaging it. I'd look at my lt1 and the harness that i have, and wiring diagrams if i had time but right now i just dont, (packing to come back to the states). I just suggest you get help from someone who knows more about wiring up a fuel injected motor, and itll probably turn out to be an easy fix.
as for swapping full body harness, it shouldnt be neccessary.
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