You may want to check out some other forums with an FE connection. That's what I did. Check out the parts for sale in these forums fepower.net, fordfe.com, and ford_trucks.com.
Keep looking. These parts are still out there, in all kinds of condition. I got a nice C7ME-A, 8A2, C-scratch, reinforced block for my 02/14/68 GT500. It was part of a full short block that I bought from Jack, of Jacks Ford Parts. Now I have an extra harmonic balancer with spacer, a timing chain cover with timing pointer, an unground 1U crank, and 8 C7AE-B rods. His email is jacksfordparts@gmail.com. He was a pleasure to work with and his pricing was fair. If he doesn't have what you need, he'll have connections who may have one.
While looking for the block, do a deeper dive to learn more about the different FE blocks. A little homework may save you from buying an incorrect block with the correct date code. I think you'll find this to be a great article to start with
https://428cobrajet.org/id-block. I found the 428cobrajet.org web site to be both interesting and informative.
Good luck,
Steve