Another tire fitment question…

Be very precise and careul in measuring/calculating here!
I sort of rushed my decision on moving my 67 Barracuda from 15s to 14s, and wanted the raised white Letter Cooper GTs.
The problem was, I was going from a 60 sidewall, to a slightly wider tire which only came in 70 sidewall.
I got some fender rub on the front end any time I went over dips and turned the wheel.
I sounded a lot worse tha it actually was.