Is there a definite cutoff line between the body color and the black such as under the bottom of the hood and on the bottom of the car or did the factory have body color overspray on the black when painting these areas. Hope this make sense. Thanks.

IF trying for total CORRECT FACTORY LOOK...over spray/bleed through is more than acceptable. Under edge of hood, inside of rear wheel housing, underthe belly ...as far as DEFINITE cut off...I don't think you will get the answer...