Hi mate,
Not sure what is legal in NSW but biggest you can go in QLD is holden 308 in 4WD, I think.
Check with your NSW main roads department for engine mods they should have a list of what you can and can't do, that's if you want it street legal.
If you can put the 351 in make sure you can get mods for things like sump, radiator and suspension. Sometimes you can get the engine to fit but keeping it cool and not rubbing on things is a another part of the V8 upgrade,as soon as you go to move it a whole new set of problems arise.
Cheers wheelie.
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