big wheels 67

Hi, I'm trying to fit bigger wheels on my mustang, the biggest it can fit actually, but I can't find out what is good. I've decided on 15'' in the front and the back, and I want to be the back to be a little bigger than the front. What can I fit, I want 275/60's but I'm pretty sure that's too much. And I need help with backspacing. It's a 67 by the way. Any help would be great, thanks.

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Will
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