Welcome to the board Mike, the way things are measured with suspension it is from point to point, the shap of anything in between those two points is irrelevent, the way you would check to see how level your lower A-arm is would be to have the car sitting on a level surface on it's wheels, measure the height of the inner pivot point (A-arm bushing) and the height of the ball joint pivot, if they are the same your A-arm is level.
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