VS and early VT wont as they didn't have the EGR valve (not that hard to change though). I think there were some other minor mods up to the VY.
Legally though, no, an older engine can't be fitted. You would have to be the unluckiest person alive to get done for it though.
I personally would be looking for a low kilometre VY engine though. The VS and VTs and even the VX are going to have some pretty high milage by now.
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James Bovard, Civil Libertarian (1994)
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P.J. O'Rourke, Civil Libertarian
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Ronald Reagan (1986)