The problem with getting vehicle's imported to the US is that they have to be able to pass all of our safety and emissions standards before hand.
Australia is EXTREMELY strict on that kind of stuff but I'm sure there's something that restricts the importation of Holdens since you never see them on the road around here.
95 C1500 LM7, built 4L60e, Circle D 3200, LT's, Nelson tune, open differential, 3.42, and LS1 e-fans. Tractionless