Guys,
Before going to to UPS or other similar similar postal services contact your local (us-aus) muscle car importer. Most have a depo in the states (LA is most comon) where you can have the items shipped to. They will then back fill there containers with small such as wheels, engines anything car related to line a little extra cash in there pockets.You will pay a fraction of the price to ship internal in the states and then f all extra to have it put in a container.
I did this with wheels a few years ago. Made it more than worth while.
Cam