[Chuck Moreland]

To the OP, you might want to check out our capabilities at Elephant Racing.

We build and modify shocks in-house. We rebuild, custom valve, and recharge sealed nitrogen gas Bilstein shocks. We also shorten and lengthen shocks.

We have Jack French's valving specs, which he shared back in his day. Now We design our own valve stacks. We choose individual valve shims to achieve the force/velocity curve we want. We match these to the torsion bars/spring rate and planned use of the car.

We have a Roerhig computer shock dyno, which we use to test every single shock we work on. This costly piece of equipment is indispensable for shock modifications. Without it, you are shooting blind. From experience, I would never put modified shocks on a car unless they've been dyno tested and proven to perform in-spec.

If we can help with your setup and selection, give me a call.