1985 D150 "Mr. Curtis" race truck with a 2015 6.4

... I don't know what to say.

With the LCAs positioned so the track width is allright, there's a misalignment in the spring perches of 4.5" present.
Meaning the LCAs spring perch is 4.5" further outboard than the frames spring perch. Second, on the 1500s frame the spring perch sits at an angle and it is straight on the D150.

I fileted the spring perch of the donor frame but it's even shorter...

Right now i don't know what to do.