A100 8 3/4 under ‘66 Barracuda?

Hi all, despite much reading, I still can’t find a definitive answer to this query. I have a chance of a 741 8.75” rear from a A100 van. I’m aware that they are wider, but wondering if the axle would fit if I chose new wheels with bigger backspace. Original 7.25 is a Suregrip, but pinion is getting whiney.