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I raced slot cars in the 60's so I can tell you the 1/24 scale LSR guys were looking at 200 mph also. There is a matter of CG location that will affect the amount of down force needed at the nose. I assume you have a flat belly pan and the will be some cooling air needed for the motor in the rear. See Joseph Katz on race car aerodynamics. As a starting point h=0.25" with a half body of rotation of the 3:1 airfoil.
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