Hello Sloth, how are ya?
I have got those prices for you .
To fit the holden ecu to your motor it is part # 09354896 $1058.20 aud
Unfortunately to use the holden ecu you will need to run the complete holden system including a PIM= Power Interface Module and also the BCM= Body Control Module
I also spoke to the guys at TAS= Technical Assistance and they say the holden ECU will not work on its own, they sugested using a non genuine aftermarket unit, as it is self supporting and doesnt require the other systems to work.
Hope that is some help in your attemt to get your car running.
I realise it is probably not the answer you where after
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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.