To do that with enough frame clearance you can notch the frame. Just remove the factory bump stop bracket thats spot welded to the bottom of the frame. Drill out the spot welds, remove, and save.
Then notch the frame with a pie slice with about 1" to 1.5" on the outside and nothing or not much on the inside. Make the width enough for factory bump stop bracket to fit into. Then weld in plates for what you cut out and make sure the factory bump stop will fit in there. Then weld in the factory bump stop.
The bump stop should be 1" or more moved up from where it was before.
A friend did this to a 68 RR street car and 70 Cuda he road races.