When I put the boxes in to move the springs into the frame rails I drilled two sets of holes for the front spring eye . one in the stock location , the other two are higher in the box , which allowed me to lower the back of the car.

I have tried air pressure from 11 lbs to 22 lbs , now it likes it at 21 lbs. In the last year the engine was down on power , just last week I did a leakdown test , the cylinders were down 23% ( 150 lbs cranking pressure. I just reringed it this past week , will be going to the track this weekend. Is it possible I am not getting any rotation because the angle on the shackel is towards the front. If so I have split mono leaf springs . I can drill a new hole for the center bolt on the rear leaf to change the angle towards the rear.