Hi there Phil, I have just last week modified my wireing loom (I too am useing LS1 power (dark side))
I bought a loom, alternator, starter motor and ecu to suit VY manual gearbox car, at a cost of $700.00.
I have been talking to some LS1 tuneing guys and they can send me a mail order ecu (exchange for mine) at a cost of $400.00 that has had the VATS (immobiliser) switched off and remapped to run better (not as good as with car on dyno but due to my location my only other choice is to fly a tuner here, not keen on that idea incase it doesnt start first go).
Once it is running then I will fly a tuner up.
So for a cost of $1100.00 I should be safe to start the car.
P.s welcome to the nut house.
Sorry Bernie, not trying to hijack your thread
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.