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I know that 245 60 15 BFG Radial TA's fit fine on my 72. I always thought the 255's looked a little big on our year cars. Not sure about how they would fit, I seem to remember stories about them rubbing on the front during turns.
There have been plenty of threads on this if you do a search. The short version is that 255 60/15 will rub on some and not on others. I prefer 245 60/15 all around on mine.