Parde says 235-60-15 should fit 65 fine. A '66 is close.
What you need to know here though is that realigning the front, particularly with more positive caster will give issues where there were none before.
Also lowering the car, changing the shocks or changing the spring rates, not to mention which wheels you are using and whether or not you have increased the track or decreased it.
It's close up there.
It's a sure bet that you will probably need to roll the front fender lips considering that there was a service bulletin on that when the cars were new. They sporadically showed rubbing issues then.
Not every car, but enough of them to require a TSB on the subject from Ford.