A couple points that might help. Use some aluminum to extend the cooling fins on the engine for more surface area. At high temperature an alcohol/water mist could be injected into the cooling air stream near the engine. The lower body should be rounded in front as in the third sketch and then swept up toward the rear as an inverted wing. Extend the rear body work behind the rear wheel about 12 inches. Seam weld some gusset plates to both sides of the frame triangles mounting the steering subframe.
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