Slider mounting question

I just went through a little fiasco getting my US Cartool leaf spring mounts installed.
I have another thread called "Dana 60 too narrow"
Anyways what I explained on that thread is completed.
On to the caltrac sliders. I am going to need to notch the frame and weld in a plate since I had to move the leaf springs inboard an additional inch.
At last, the question.
Where should the spring eye center sit in the slider?
Hopefully this can be done without weight on the springs since the car is a shell as of now & I have no wheels for the car yet.