To calculate the A/S you need to know the height of the CG.
There are probably pictures online on how to calculate it but I will try to explain it.
Draw a vertical line at the front tire contact patch.
Draw a horizontal line at the CG height and intersect the vertical line you just drew.
Now draw a line from this intersection point to the contact patch of the rear tire. You should have an upward slopping line from the back to the front.
This line is your 100% anitsquat line. If your IC is on the line you have 100%, below the line is less and about is more than 100%.
If you want to have a street/autocross car I would keep the LCA parrallel to the ground. This keeps you roll steer neautral.
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