Do I need a snubber on a 8 3/4 rear end?

You set up the front half of the spring to be or act as a link bar. . .

The rear half is the spring, then you take the snubber and throw it with the rest of the removed weight pile.

Getting the ride part of the spring right is trial and error on what you want playing with different rate and length leaves, the front section needs a couple killer 900 lb leaves.
Then you'll have a ladder bar, without the ladder bar

Wow that is a whole lot more work than an adjustable snubber. I had a 72 scamp 440/727, J-converter. 4.88 8 3/4 spool with the 002/003 springs and they worked great, 1.34 60 fter's. one day i was under the car and noticed that the car was leaving so hard that the axle was wrapping up and both shocks were dented from the housing hitting the shocks. New shocks, adjustable snubber, end of problem! 60 ft times improved to 1.31-1.32. Works for me! But this is a highly debated subject.