That is a short block only as I contacted them, because I thought it was a great price.
So add the head, gaskets, blue printing, fitting together and transport.
Then customs of 5% and GST of 10% of the costs plus the transport. Quarantine, port docking fee, customs clearance handler. Id say your looking at about $23-$25k for the base 3.8 engine.
Not including your labour, insurance, picking up the engine fom Port Kembla, the cost of money exchange, paying the money 3 months before you get the engine.