What size tire using 15x6 wheel?

1967 Barracuda fastback with factory stock front suspension upgraded with front factory sway bar and factory lower control arms.
I want to use the only 15x6 Cragar s/s wheel 5 on 4 available on the front of my car.
The only back space they show is 3.375
What size BFG T/A can I use without rubbing?
Thanks in advance