Tire & Wheel Question 68 Valiant

You'd be better off converting it to at least 14" wheels. There are a lot more tires available in 14". But if you are trying to keep it 650-13 you have a wide choice of tires from Coker: https://www.cokertire.com/catalogsearch/result/shopby/header_year/22.93/header_make//header_model//q/650-13.html