The geometry of any MII front end should be the same, if done properly.
There are some good pictures here of a crossmember based system:
https://www.1952chevytruck.com/1947-53_chevy_truck_tci_ifs_suspension.htmPay particular attention to how far out the upper arm mounts are compared to the lower arm mounts. I am not sure how similar a 52 frame is to your 48, but it is closer than any of the other ones I have seen. The kits appear to be for 48-54, so I think it should match?
If so, it looks like either your upper mounts are installed too far in or your lower mount is too far out.
TCI has a nice kit that is well regarded, maybe you could get some dimensions off theirs to compare to yours and get at least a WAG on what you need to do.
