I ran into a similar problem and went the unconventional route yet keeping it within the "family" of ford's. I could rename my the BS machine! Big Scoop that is!
It's a '57 Thunderbird 3 1/2 inch scoop, pictures:
http://www.clubcobra.com/photopost/s...t=1&thecat=500
&
http://www.clubcobra.com/photopost/s...t=1&thecat=500
It has a shape that tear drops back rather than the traditioal rectangle Cobra shape. Think hard and long as I don't know if I would have gone this route but it DEFINETLY gives my car the EXTRA bad A$$ look it deserves! Best wishes. If you want to know where to get one let me know and I'll dig it up.