V0511FSB is stamped on the engine pad and below that is
CES178154
This is in the 1969 Camaro that just bought.
Thanks
Looks like a 350 truck block, originally installed in a '78 pickup built at St. Louis - I think you'll find that it's C8S, not CES. Might be a 4-bolt, but you have to drop the pan to find out.