dtmlevatan
Long time lurker
http://www.rimsntires.com/specs.jsp This is a nice site to play on for tire ..... DTM
When you get it aligned, ask them to adjust positive caster as high as possible. Doing this is recommended with radial tires and moves the spindle top rearward, gaining clearance between the front of the tire and the fender.
You mentioned that you need an alignment, that in itself may solve the problem, they should also check/set ride height when doing the alignment. Had same problem on my 68 after swapping to big bolt pattern and once the front end was properly aligned, the problem was no more!
Good luck!
I've been looking through the chassis book. I don't see a whole lot. There may be a little as to the distance between the bumpers and the stops but it's vague. Of course hitting the fenders is real vague too. Are they hitting as the wheels turn? Or are they hitting as the car sits? Were these the same wheels the car had before the rebuild? If not, what's the back spacing? If they hit when turning there's a slight chance an alignment may fix it. I've had my Mopars riding all the way up and all the way down in the past and have never hit. I was going to go out and measure my ride height but it's cold and the barn is a long ways away. I'll try to get out there sometime soon.
I would have the alignment and front end checked. That 215-60-15 is the "go-to" size for people running a 15 on the front of a 67-69 Barracuda.
It should work well (but in my opinion, look a touch short).
The E70-14 that came on your car from the factory was about 25.7" tall. Even these are close (but don't rub) on my car.
Going over 26" is risky without careful wheel selection.