Without looking up any propper info... I don't think you need your car fully engineered. Not in Tasmania at least, from the last time I looked into it. Generaly, the block is the same as the one you took out of the car. You are just changing engine number. The head is changed yes, but it makes little difference. Just maintain normal rego, and get the engine number changed on your rego papers and thats it. If the rest of the car is within normal limits (wheels only 2" bigger, no turbo or anything), then I wouldn't worry about it.
If your car gets inspected every year with emissions test (not sure about NSW), then natrualy the car has to pass the basic test anually.
Cars with wild mods that have been engineered (like a SR20 turbo in Datsun 1600 for example), I can't remember them ever having to have the emision test. The engineer just makes sure its a reasonable and safe combination of parts.
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