Unless that chassis was available in Australia with that motor, you legally need to get it engineered. You will probably get a RWC somewhere, but RWC's and engineering are different. Have had correspondence with Vicroads in the past that an AE86 with a totally standard 4AGE factory setup will require engineering as it wasn't an option here.
I await the howling which may now descend about mystery low volume imports by Toyota etc etc. Whatever, that is what Vicroads informed me.