235-60-15 on 68 Barracuda

Im in the process of rebuilding the front suspension now. Stock 340s now. I have not decided on what disc brake conversion I will use . I am running 383 t bars. Would like to run an autocross once in a while but nothing serious. Was going to run 15x7 or 15x8 ralley wheels with 4.5 backspace. As you have stated tires are getting hard to find for 15s.