Need some help controlling body roll

OK so I measured it out and the backspace on the wheel is 4.5 inches. The wheel is a 15×8. I guess I would need another half inch of back space,, maybe a full inch.The leaf springs still look mighty tired to me, but they don't look bad. Might be a competition spring of some sort (4 leafs). They pretty much lay flat when on the ground. I need some advice on this as I am torn on what way to go. New set of springs vs. new rear wheels. I have added pictures for your inspection. Thanks in advance for any direction you can give me. Hopefully these photos aren't too large. If they are, I apologize.

20200609_064722.jpg

20200609_064743.jpg

20200609_064814.jpg

20200609_064826.jpg

20200609_064843.jpg

20200609_064911.jpg

20200609_092729.jpg

20200609_093019.jpg

20200609_093029.jpg

20200609_093847.jpg