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i must assume thet you dont have an emission decal on your rad support. if you do have one but its obscure clean it off with "dawn dishwashing detergent" and a soft brush. this way you wont erase it.
It occured to me that you never gave an engine size, carb or tfi, or maby a callibration # from the valve cover if that applies. send that along next time to narrow your search
oh crap i can't believe i forgot that, and i never do that, i guess i keep forgetting that f100's don't just have 300's and 81's don't have tfi, it's duraspark. nope, no decal, half of it is ripped in half