[steveproracing]

Build the car exactly as you would for three degrees antisquat. Then in the hrc shim kit there is a really thin shim (a little under a mm thick). Add this shim under the shim for 3deg squat. So instead of having 1 shim under the front block you now have 2 shims. Thus raising the front block to beyond 3degrees
To approx 4 degrees

The insert inside the block is still the hrc 3 deg block
But this insert has no effect on the antisquat it just keeps the gearbox level. Therefore it can cope with being a tiny bit off level from the extra shim.

4degrees of antisquat give much more forward drive.
I was really impressed how much extra it gave me.
That combined with short wheelbase and the hrc 4.5 block helped give me a really locked in rear end. Much more than putting the rear weight kit on. All that did was make the rear of the car into a pendulum.

Hope this helps