This is bad news for us Y block guys since we have no other options. I pulled this of the FE Forum

Discussions with several folks at PRI indicate that the days of the flat tappet cam - as we know it - have come to a close.
The only source for cast cam cores - CWC Textron - has apparently stopped shipping castings
A high defect rate, coupled with a large OEM contract for other products, has forced a decision to step away from camshaft casting
Unless/until someone finds an alternate source -- flat tappets are going away soon.