Yeah see ive never done any of this mate being only 25 I was into the newer cars and don't know a heap about the older cars unfortunately but thanks for your advise mate yeah $300 is cheap as, I reckon 28 spline would be fine the cars not pushing a massive amount of power I've got future plans of a turbo but that'll be a while away
All it's running at the moment is injected 304 with 276 cam flat tops other then that mate she's pretty standard (when I eventually get to starting it anyway)
Definitely work with what you've already got, and if you encounter problems later down the track, deal with the diff then. If you can find a 10 bolt diff with reasonable gears, you can have it rebuilt with a trutrac center and the whole diff will bolt straight in without any fitment issues. Better yet, as sandman says, a VLT diff is the way to go if you can come across one. Don't bother with an lsd 10 bolt, they're damn near impossible to find, and if you're lucky enough to find one, it'll probably need to be rebuilt anyway.
Whether the existing diff will handle it or not will depend on a lot of variables. If it's a manual, it'll be more likely to break if you're a little harsh with it. Good tires can also take their toll on the drive-line if it's not up to scratch.
I can't really help with any info on brakes though. There's a fair bit of information on here and AV8 if you're keen to join up there too.
On an unrelated topic, do you have any videos of the car running? Does it have much lope? Thinking about using one for one of my projects and would be good to hear from someone that has one