to be honest it is easier to get it imported but it it will cost less to have them shipped in parts,
if your living in australia it is probably the easiest way,
if you want to find imparticular parts you could try "chevytalk.com"
there are alot of parts and people you could speak to that have wreckers where you could pick it up from,
on that type of car it will be hard considering that it is a vintage now and the people that have will not part with that type especially if it is the convertible series.
hey nice choice in car though.
try autopartswarehouse.com..if u need a good repair guide-try autozone.com and use the link in the right handed coloumn to get to their free info guides on step by step repairs for your vehicle.....good luck!!