Hello again Sloth, further to your enquires regarding an engine harness and ecu i found this in a magazine
https://www.americanautos.com.au/secure.html
it says that you require 98-99 camaro/firebird ecu, maybe some of our American friends can help with a price to that and possably send one over in a bubble wrap post pack. The part number you need for the wire harness is 60506. Or if you want longer wires so you can hide the ecu use part#30607.
This is a link to the company that makes the harness, there are no prices here but if you email them i am sure they could give you a USD cost and maybe our American friends will help and send one over if it is cheaper than the Aussie supplier?
http://www.painlessperformance.com/harness4.htm
Good luck , hope i helped
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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.