It's not as complicated as that.
The shims are marked 0, 1 and 2. (And come in pairs, one of each shape)
Whatever size shim you use on top of the rear block use the corresponding size shim under the front block. (Not on top) This keeps the total height of front and rear blocks the same.
If you do this the gearbox will remain level but the hinge pin angle (anti squat) will change.
The thicker the shims the greater the anti squat.
Give it a try.
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