Tire fitment 68 Dart

I don't know, not a dart owner. But, unless you are building a handling first car, I tend to be conservative on front tires.
215/65 might be too tall, 235/60 too wide (for the car, not the rims.)
Why not split the difference? 225/60x15?
And to tell the truth, I'd rather see a 3 3/4 or 4" bs