Gregg, if you haven't already tried the wreckers, I find them pretty reasonable down at South Gippsland Highway Auto Wreckers. I mentioned the Cobra after the 1st visit and they were soon asking about the build and even threw in a uni joint and steering wheel for nothing when I went back for the steering column. It's a massive wrecking yard and they told me they get the odd LS1 wreck in from time to time. Might be worth a go.
http://www.sghaw.com.au/
Paul