An r32 gtr came out with 225s on an 8" wheel. What Manwhor3 said is correct.
Generally, on an 8" wheel, you'd fit 225s or 235s.
It is possible to stretch 205s on. This will give firmer sidewalls.
It is also possible to fit 255s on, but I wouldn't do it. It will actually decrease the traction around the corners. Sidewalls will be really floppy. It will look like a rounded blimp.
At the end of the day though, it depends what purpose the tyre is used for though. If it is for drag only, sidewall flop doesn't matter because you're not cornering. in this case, a 255 tyre like a bfg drag radial would be good.
But for cornering, I wouldn't do it.