The sort of prices being quoted in Aust. are simply ridiculous.
Have a good surf through Trade me here in NZ and I guarantee you that you will pick something up for around $350- 500 max. when they come up- and they do come up from time to time.
Get yourself a freight forwarder organised, get the seller to send it to them and ship it over.
The 63A box is an excellent box and what I used behind my turboed A14. The only issue that I ever had was the 'detents?' playing up.There is a bit of a gap between 2nd and 3rd but the way that engine pulled it simply didn't matter.
Good luck.
Dave