heres all the rules and regs you need. you MUST comply with all the rules or they will crush your ride on the dock side!! (no joke)
you are only allowed 1 personal import every year, the van might come over as spares, a different catagory and different tax bracket, but still it will be cheaper on the transportation costs, everything in on 40' container!!
have a look here.
http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/importing_vehicles/general/EligibilityCriteria_2.aspx
its not easy, but if you want your ride it will be worth it! (yours should be easier than mine due to the age of the car and its "spares") you will need reciepts for eveything, tax, insurance, fuel if poss, purchase, all new parts are charged at a higher rate than s/h parts, get reciepts from shows for all that NOS you got, YOU have to prove its second hand, they only need to say its new and "kerching" the tax goes up!!!