8 3/4 springs on the cheap

The tires are tall and I do get a little rubbing occasionally. I think it is tread and not sidewall though. The wheels have a 4" backspace as far as I know. I bought them used from a member here and they came off a 65 Dart so I just brought them home and bolted them on.
They look good.
My current ones will rub the sidewalls a little with a full tank and a couple of grand kids in the back seat.
Thank you for your help and have a good weekend.