Ash is spot on with the above advice. I used Enkelman and Associates in Braeside (as he mentioned as well), as after calling pretty much everyone on the list they were the only one willing to engineer my car (PNW10 SR20DET in an N15 Pulsar.) I needed an engineers cert. to change my engine number over with Vicroads as the engine was never released in this car. For a change of engine they inspect tidiness of the conversion, engine mounts, ride height, brakes, noise and emissions. Emissions is quite a strict thing. Different year models fall under different ADR's for emissions, and regardless of the engine you put in the car must meet emissions of the year your car was made. 97/98 is when the stricter ADR's started being introduced.