I don't know anything about licensing for street use in Austrailia, in the US it is easy, as long as you have hobbiest or collector plates on it, you can change pretty much whatever you like (otherwise, you have to meet emissions standards for the car or engine, whichever is newer).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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