1967 late L78 block or 1968 CE L78 block

[Pusher_Man]

i have a 1967 4K camaro dated 07B (very late). Im looking for a 323 casting numbered block with a tight time frame of probably last week of June to 2nd week of July.

if i don't get very far with that then i can use a 1968 dated 323 casting CE block.

of course all need to be L78 blocks; 4 bolt main, etc.

please let me know if you have one or know where i might locate one. this is a very, very, very rare car that deserves and will have the right stuff put on it.

many thanks,

kasey