Hi Mossey
Welcome to the forum the 3 requirements for rego are headlites which dip to the left (holden premier ones are direct replacement). Orange rear turn indicators,( a modification to rear wiring is required to make reverse lights to work as turn indicators & change globes to twin filament orange type) australian compliant seatbelts.(I have kits to suit this car). After these mods are done, Engineers report for mods,weigh bridge ticket,blue slip inspection,rego.
Check with who you are going to get to do blue slip, they all interpret rules differently