1969 dart front tire and rim question

My brother runs that size tire but on a 7" rim on his duster and also has rubbing issues. He has more space in there then I do on my dart. Aside from getting a new tire/rim size you could try to extend the brace but I don't think that will help much. For example, I am running 215/60R15 on a 6" wheel and have plenty of room