Ah, if you're in Canada, it's probably easier and cheaper for you to use a mail order firm like JEG's, who are based in the US and ship across the border with no problems.
In terms of what you'll need, it'll cost in the region of $1.5-2k all in I imagine, but that's for brand new parts, and all of which could be sourced cheaper if they're used.
Aside from the fabrication involved, you'll need to measure total axle width to judge what half shaft size you need. This is as much dependant on the tyre and wheel combination you have, as well as total vehicle width.
The backspacing of the wheels is often missed, and this is quite critical. As the 240sx was never designed for a 9", the half shafts are likely to be custom, but that doesn't make them overly expensive. Mark Williams or Strange offer custom shafts in all lengths, at the same price.
If it were me, I'd get the car jacked up somewhere where you can take lots of photos, and approach a chassis builder in Canada, or even somewhere in the US (there's hundreds, if not thousands, as oppose to the 10 - 20 here in the UK).
The other thing to bear in mind is what suspension setup you plan to use. Leaf springs are cheap, cheerful, but quite hopeless. A 4 link is the best route if you're planning strip time, but again, this involves some fabrication to make it fit. All vehicles are different though, so it's difficult to say specifically what you'd need.
