Greg:
There was a guy that made them (only tall) for 351C's out in the midwest. It was back in March that i saw him advertise a set of them on Ebay, but he got big bucks for them. I think it was like $420 a set and he had his own machine shop. You can scout ebay for him. There's another guy that you might contact. I bought a set of Chromes VC's off him and he has Ford molds for 351C Valve Covers and puts on the emblems (not stickems). His name and email is:
TOM NASH
4322 N. DAMEN AVE.
CHICAGO, ILLINOIS 60618-1706
coily5@yahoo.com
You might try contacting him and see if he can help you out. I paid him a $120. for custom 351C valve covers with nice emblems on them. All I can think of for now. You're on your own.
Bernie