23. PICKUP POINTS: Absolutely no modifications of the frame pickup points, rear axle pick up points or spindle pick-up points permitted.
27. RADIUS RODS/PANHARD BAR: The radius rods and panhard bar must remain within the stock dimensions (radius rods - either 5.5”, 7.0” or 8.25” in length / panhard bar 11.0” in length), aluminum thickness, location, and configurations of the original, as currently delivered by U.S. Legend Cars International. Each length measurement will have a tolerance of +/- 1/8” (0.125”). Steel radius rods or panhard bars are not permitted.
Trailing arm mounting measurements are on page 106 of the Appendix.
Could you have a bent mount or radius rod? Is the rear clip square?
Just thinking out loud on this.
Steve