well as a reference point:
$11,500 US you can get a 3.8 litre AMS built engine. $800 shipping + taxes, so for $15,000 Aussie you get an AMS 3.8L built engine to your door.
for about $22,000 Aussie you will get the big bore sleeved 4.0 race spec AMS built engine to your door.
these prices include AMS supplying a new short block