Well,more than one person here will tell you a 275 is too wide for an 8 inch rim and quote a tire manufacturer recommendation for 17x8 wheel.
I've been running a 275/40/17 on a 17x8 rim for 18 months with no problem.In fact,the manager at my tire retailer suggested it.
I keep hearing here about "bulging" sidewalls with this combo....cant say I've seen it on my car.Maybe with a 275/60/15 on a 8 inch rim I've seen massive sidewall bulge.Hell,just a couple months back I seen a 69 Camaro in a magizine with 295/60/15 on a 15x8 rim.....talking about bulge.LOL
I have a couple of pictures of 275's on a 17x8 rim on my signature. I think it works.