[tcobra]

Hello all,
I have had these for 30+ years. Got them with the claim that they were 428cj heads.
I am going to build a 428 for my Cobra project and would like to hit the 500+ mark.
Wondering if these heads will help hit the mark or if I should keep saving up for some aluminum heads.
Also would like to know if these truly are CJ heads.

Can't seem to get the casting # photo to upload.
Casting # by spark plug hole - C6AEU
#between valve springs - 6E23
Letters by bolt/spark plug hole - DIF with another "D" near the edge of the head at an angle below the "DIF".

Thanks for your knowledge.