with the new casting technology..
the "Foam filled casting core" type
the quality of the casting has gone way up.
no core shift..
seems to me this method would fix most of the core shift and poor casting issues...
i dont know how that figures into the old tooling core boxes /parts that are apearently still around..and being refer'd to in this thread
but since youd need the licensing from Mopar to make any of these parts.....they need to do something..

on the w5 heads if they just offerd a head with out pushrod holes machined you could do it either way 48*/52*...no?
cheapst.