Hey mate, hope i'm not to late responding to this. I have the same conversion done to my cressida. I rang up vicroads a while back and was told (they looked into this) that if all the mounts etc are factory and all the emission gear is still there and everything else has been upgraded to spec (brakes, diff etc) then you don't need it engineered. Just need a letter from a toyota dealer stating that the JXZ81 is a factory car in japan, go into vicroads and they'll check everything over and change the engine number over. This reminds me to do that also as i keep forgetting to do it. :hmm: