Rear Spring flip on a '81 C10

[Richs'55]

Long story, but putting a '55 cab & box on a '81 C10 frame. Want to lower the truck. Got the front figured out but have questions on the rear.

Has anybody flipped the springs under the axle without doing a C cut? Has it worked out for you and how much did it lower the truck (rear).

Anybody ever changed the spring mount higher on the frame to get a lower stance? Is there any kits like this? Looks like there would be room to do this and still not get into the box floor.

Any other ideas? I want to lower it around 5-6 inches.