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The 255/55-17 is 28" tall so it could pose some clearance issues in the front on the leading edge of the fender and on the rear corner of the fender at the rocker molding. Look at a '78 Pace Car and see where the front fenders were "trimmed" to clear at the time the new 255/60-15s which are 27" tall.
I'm running 235/55/17 and the back is fine but the LH front rubbed slightly on the edge of the fender at the front of the wheel. I put this down to the PO not fitting the replacement front clip perfectly evenly. I wasn't prepared to cut into the fenders so changed the front tires to 215/55/17. From memory a 235/55/17 is the same dia as the original "70 series 15" tire but they were more rounded on the edge. I felt the 55 series tire filled the wheel arch better than the more often chosen 45 series 17" tire.
