SuperStock spring tips.
A-Body-Bomber,
A better example.
Jack Werst's 1965 Plymouth Super/Stock
Back-in-the-Day,
I had a chance to 'peak' under the car, and see the 'shim-plates'.
Jack Werst, said 'Pre-Load' makes the car launch forward quicker.
Instead of 'lifting' all the way up first, and then launching.