3TGTE motors (no box) seem to be worth around 500 to 800 complete depending on condition, the box and clutch would be around $300-400 by itself and maybe more if the bellhousing was sold separate to the box so all up I say you might be able to get between $1000 to $1500 from the right buyer for the complete package if it is in good running order.
There was a complete 3tgte setup on ebay (same stuff as you have) in Vic about 2-3 months ago. I vaguely recall it either didn't sell or that it didn't go for more than $1000.
People feel free to disagree with my price estimates but at the end of the day its worth what someone is prepared to pay for it and 3tgte motors are not in as much demand as a 2tg or 18rg motor.
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