Bottom dollar for a low mileage 159 2.2 JTS sedan (I presume it's a sedan) with engine failure is probably $400 complete; unless it's a clean TI spec as well, it might be hard to sell much of value from it before scrapping.
I'd start sniffing around for a garage with more pragmatism. No suggestions as I'm nowhere close.
For a used head if the old one has gone soft, you'll find a reputed wrecker in either Adelaide or (more likely) Melbourne.
To source other rebuild items there are a number of choices, within Australia people like Arese, Preston Paige, EAI all come to mind. Overseas there's some good vendors including Shop4Parts.