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Use a offset calculator to compare your current wheels to the new wheels. With the new dimensions, check the car with a tape. Do you clear the suspension, brakes calipers and fenders? Reference: http://www.1010tires.com/WheelOffsetCalculator.asp
The 275 width tire and the -15 wheel is going to require a massive amount of neg camber if you are lowered at all. And you'll probably still rub, but it'll look mean!
10.5 -15 rear and 8.5 +23 front will look horrendous unless you plan on having a 33mm spacer in the front lol. If that conservative front is all you have to choose from, aim for a 10.5 +24 rear or so. Otherwise, get a low/zero/negative offset 9.5 up front to line up similarly with the rear.