Ashley
This is negative camber and a Supra should be set like this. The exact camber setting depends on a few variables, and as Chris Wilson says will vary a bit on road cars anyway. Measuring camber is not rocket-science and a camber guage is just a glorified spirit level. You can buy a camber gauge (the Pace one) from Demon Tweeks for about £75 + VAT and measure your own.
Short of accident damage, worn/lose suspension, or heavy kerbing, camber doesn't change.
I have my car set at about -2 degrees all round. This is probably not perfect for tyre wear, but it does work well on fast corners. I've done track days with it and taken tyre temperatures and they confirm the camber is fine. If I were starting from scratch with standards suspension and tyres, I would set at -1.5 front and -1 rear and go from there. I imagine there are factory settings knocking about in this board, but don't go looking for more than half a degree here or there.
If you're coming my way, let me know and I'll have a look.