Correct, 16x8 +10. The whole issue of stuffing more tire under your car is more than just tire width. Even Clifton had the same issue with his car. It is a combination of tire width, the tire itself (they are not all the same), and wheel specs.
A 16x8 +0 will not support 245's without flares. Granted, I am running +10mm spacers in the front (which makes mine +0 effectively) for brake clearance, but the rears won't work. Clifton was running higher positive offset wheels to stuff 275s without flares. You can't push the wheel out, you need to suck it back by running higher positive offset wheels.