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It is legal, VR's run the same emissions ADR. A friend of mine is putting an RB30 into a VR ute very soon now. 1997 is when things changed. ADR 37/00 Runs from the start of unleaded in 1986 to 1997, you can interchange any engine in that range of years as they all passed the same test. From 1997 -2003 is ADR 37/01 from 2003-2007 ADR 79/00, then from 2007- ADR 79/01.
You can put anything from the ADR the car came with in or anthing newer in. But you can not put say a motor From the 80s that was ADR 27a 27b or 27c in
whats the benefit of an rb30 over a 3.8 ? , just curious.
i would have said the same thing about the buick though.