From what I have read on here. Nitto 275 will fit on the stock 8" rim. It would fit, but there would be a little bit of sidewall buldge. I have been looking into this recently myself. There are those that will say it is safe and those who will say the opposite is true.
I went ahead and decided on the Nitto 255/40/ZR17 Extreme ZR's. I will post some pics when i put them on. However, tires aint cheap and im gonna be milking the last bit of tread i have on those stock goodyears. So it may by 1-3 months away.
A "Plus Zero" application refers to installing a different size tire, say, slightly wider than the original tires, but one that will still fit on the original wheels.
Every manufacturer out there recommends no wider than a 255 on an 17x8" rim, even Nitto which everyone will agree runs narrower than most. Go to the manufacturer's website for the tires in question and look at the specs.
I have BFG 275/40/17 tires on my rear bullitt wheels and there's a slight buldge. I probably wouldn't put them on the front because I don't know if they would rub