Brad, I think it should read CWC (Campbell, Wyant, and Cannon Foundry - now known under CWC Textron) which is the foundry for the cores. They provide the cores for CMC and EPC.
According to the website they only produce two types of cores: ductile iron and alloyed gray iron. On CMCs webpage they only list one type (material) of core for Mopar BB flat tappet: Proferall (I assume it's Proferall ++). They have two different cores in terms of LSA/duration.
The same material is used for pretty much all flat tappet cams according to their catalog btw.