Fellow Aussies I need help!!

[55pickup]

Hi, Guys I'm looking into buying a 55 GMC thats for sale near Brisbane, I'm in central Queensland and i'm having massive worries about laying down the cash, Its not registered and it has a 350 in it instead of the stock 283. I don't mind doing some work to make the car legal and get it on the road. I just cant pin anyone down that will tell me what i need to do to make it compliant, I don't want to spend 20grand after i buy the car to get it on the road. Its my first time delving into classics so i'm a bit lost Cheers for any help.

Heres the link to the ad.
http://www.carsales.com.au/private/d...2130839/?Cr=31