I have a strange set of head casting marks on my 350 and i can't figure out which set i'm looking at, I've searched, and retyped, and researched over and over, and all i come up with is the same basic head ID guide that doesn't have my casting marks. Each head has a pyramid cast on it, not a standard pyramid, Aztec pyramid shape. I.E. looks like two staircases leaning on each other. Can anyone ID these for me? Much thanks.

 

got any #'s on them?