How are these spacers going to attach to the spindles?
I remember seeing some made for earlier "A" and "F" bodies that had a straight bolt going through the upper taper holding a spacer that the taper bolted into.
Looked a little scary.
BadRod questioned mounting the ball joint to the bottom of the upper arm.
While tilting the arm upward, it would have no effect on the roll center as the ball joint pivot and the inner pivot would still be the same height off the ground as stock.
If you are going to go to all the trouble of fabbing up new upper and lower arms I wonder if a guy could go the extra mile and adapt a completely different, taller spindle from something else.
How tall and tough is a C5? Granted the car is a lot lighter