Engine Compartment Color

Help.. I am trying to find out (before I paint) where the body color ends and black starts in the Dart engine compartment. The area that seems to be a problem is towards the front where the radiator mounts and the hood latch supports are located.

I looked at several today at a Good Guys show and seems like they were all different. I am trying to find out where to spray body color and where not to. Any help Would be appreciated. THANKS