Even if they are original 428 CJ heads they are 50+ years old and represent 50+ year old head design and flow technology, not to mention they are cast iron. Find someone that needs them for an original restoration, take the monies you get and buy a set of Bear Block Motors heads.
The BBM heads have stunning flow characteristics for an as cast head right out of the box and also use modern combustion chamber designs for better flame travel and combustion. Here is a link to their website =>
http://bearblockmotors.com/bbm-ford-fe-cylinder-heads/
Ed