[Modena]

The rules have recently changed in Vic, you can now run whatever engine/induction you want, but your ICV has to pass a cut-down version of the ADR37 emissions test. This means a factory tune LS1 should pass as long as your cat/exhaust combo doesn't foul up the tune. If you can get a big block with webbers to pass this test then your engine/induction implementation will be ticked as legal.

You have to undergo this test even if you install a factory tuned current brand new motor that has passed even more stringent emissions tests (like an LS3).

The above is my understanding from what the engineers have told me over the past two months or so.