Is a X head 894 casting only

Guys I am not happy but that's ok. To the point I have a 915 that a man claims is an X head. He seems honest but let's look past all that.

Looking for direct responses but is it possible for an X head to have a 915 casting number? I have been told no by someone I surely trust and he knows mopars but I want to comfirm with others.....

Thank you in advance....
JW