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You need to figure out the CG of the car right, then you can figure out about where you would want your roll center to be, and thus, arriving at a conclusion as to about where you would want to place your FLCAs.
There isn't a "for this much lowering, the FLCAs must be at ____ angle" rule.
It's all relative.
Look up how to find your CG and roll center and stuff, there are plenty of racing suspension related websites that go into detail how you can calculate for that kind of stuff.
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