If the engine came in the same chassis as you are putting it into, you need to ensure that you have the same spec on other stuff (brakes/suspesion/emissions) in teh car that you are going to put it into.
Then i do not belive you need any sort of modification plate, as you arent modifying anything, merely taking standard bits from the same car, just a different model.
even when you need a mod plate for other conversions you dont need any emissions test if you keep all the same emissions gear as what came standard on that engine (ecu, exhaust, cat etc)
but dont' take my word for it.
ring this guy.
http://www.modplate.com.au/