2:20 should be adequate to transfer. You will leave Customs and proceed to an Ansett check-in counter just like you're beginning a trip, and they'll ticket you there (or rearrange your ticket if there is not time to catch the original flight) and you'll check in your bags. Docmestic Australian airlines won't let you carry-on the 21" bags we're used to in the US; you can carry on an 18", but not lots of packages. Arrange your international carry-on luggage so that you can check everything but the computer bag, if you have to.