Driveline Hitting underside of floor (at rear)

The car has the Hotchkis TVS front suspension system and the matching rear Hotchkis springs. I contacted Hotchkis and they gave me the dimension from the center of the wheel to the underside of the wheel lip opening (12.5 inches) for the rear tires so I could check if the leaf springs were saggin. I measured it and they are dead nuts on 12.5". The Hotchkis leaf springs lower the car 1" from stock and that appears to be where it's at. The issue still is the Dana 60 is a much larger (physical size) rear end compare to what the car came with. Before swapping out the rear ends, I will have the pinion angle checked and make any adjustments necessary. If that checks out, I really only have the swap out option which I'm OK with. It fixes several issues with one action.