Never tried that exact tire.

The quarter panel pictured is of a 65 Dart. I have made that wheel opening. Recognize the body line. Valaint and Barracuda do not have the body line over the wheel for information. But, as far as fitting tires they are the same other than the lip sits a little further in on the dart.

I know a N50-15 will fit with an inboard spring kit and mini tubs with no cutting of the quarter and a 15X9 centerline with 7.25' back spacing. The 275/60/15 is the same as a L60. Less backspacing and should not have to minitub. But, the leafs need some moving. Sorry I just not 100% sure on what has to be done for that specific size. A G60 will fit with no work at all.

Leon