Relocating Rear Leaf

View attachment 1715387528 View attachment 1715387529 im sure this thread has been created before but I couldn’t find it. I have a 69 Dart with stock spring location. I’m putting a Ford 9 inch built rear end in my car and I want to move my rear springs inward. Is there a kit that does this? Is there anything I should be worrying about when it comes to the narrower suspension? All the work is going to be done professionally when it comes time. As you can see from the photo with the original rear end, I have a fitment issue and these are the wheels I will be running.
I'd look at US Car Tool. Thet have a great set up. That's where I'm heading.