wheels and Tires for a 64 Barracuda.

You'll have a lot more choice in a 4 1/2 bolt circle wheel, but still stuck with limited choice for the front 5 on 4
I don't know if the disc's can be redrilled for bbp. There was a thread here, many years back, on using early mustang rotors to get bbp with the KH brakes.
I also have a disk brake conversion for the front and that will put to a 5 on 4.5" bolt pattern. i am looking at putting 15" wheels on it.