The back may get into the inner fender. I run a 255 on a 17x8 with 4 1/2" os backspace. I'm pretty sure a 275 on my existing rims will fit (tho the rim is a touch narrow for a 275) Another inch of rim on the inside would put the sidewall into the inner fender in my 68. Can you get the rims you want with a 5" bs?
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