Damo, from your profile looks like you are in QLD.
That engine the way it is will not comply in QLD. It's needs to be a unmodified production engine. In QLD you need a ADR 37/01 emissions compliant engine. To play it safe, that means an Aussie 1999 or later engine, or 1990 onwards USA engine.
Or you can run any engine on LPG and they can be approved. So you could LPG that Chev.
Before buying the kit I would get a copy of the paperwork including chassis testing stuff and contact an approved QLD Trans engineer to see if it can be complied here. I can PM you an engineers name & contact details if it helps.
Oh and welcome, you've come to the right place for advice. Enjoy the ride.
