I thought the same but after asking those in the know I expect the existing shock mounting points would fail if they had to take the additional forces of a coil over...
I agree dedicated mounts would need to be fabricated, given those shock mounts can break without encouragement. But then just a few plates welded to the axle to accommodate top and bottom links, and a panhard rod whilst you're at it, would allow those saggy leaf springs to be chucked

![[Linked Image]](https://i.imgur.com/IP7wzAK.jpg)
Job done
