I had my Silvia LS1 swap engineered by a bloke called Grahame Senior, but I'm pretty sure he retired very shortly after doing my car because he's no longer on the list of VSCCS engineers.
I've heard Terry Toomey is good, and I met with Peter Gillard a long time ago to discuss a potential project. Peter was very helpful and was very good at explaining the requirements for getting my project engineered.
Good luck and let us know how you go!
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http://barberprecision.com.au/
1976 Datsun 260c
1990 Nissan Silvia S13 (LS1 swapped)
1993 Mazda MX-5 NA6 (was KLDE swapped, now turbo BP) <- SOLD
1996 Harley Sportster Sport XL1200S