Knuckles
It wouldn't surprise me if it isn't the "Cobra Jet" logo..... That vehicle would have been a prime candidate for a 351 Cobra Jet.....the cast-piston, hydraulic-cammed little brother of the Boss 351.... Seems like there might be some "ram air" lettering on the sides of the hood scoop...... Check the VIN to decode the engine option..

Aeonyx
Include a pic!! If you have a ram air/shaker hood scoop, you might have something! There's all kinds of stories of motors showing up in cars where "experts" didn't expect them... Boss, Cobra, HO etc. My guess is that its a graphic package (maybe dealer installed) that has little to do with the motor... especially if its pictorial with no specific lettering. But, like knuckles said, the best way is to be sure (at least of what was in there originally) is to give the VIN number to your Ford dealer to decode. With a 40 year old car though, there's been a lot of years for people to monkey around with whatever was in there stock... there are numbers (like D15E-6005) on the heads, block, intake etc, that will tell you exactly what they are.

mike - an American
Doubtful that it is a "special edition" as there really weren't any that year. Ford didn't have many decal packages for these stock, certainly nothing large in front of the scoop on the hood, so someone likely added it.