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Hi t,
The photos you posted show only that it's an 010 block (the end of the casting number) which is a 350 cubic inch block that was used for many years in all kinds of Chevrolet products.
On the front of the block just forward of the right side valve cover there should be a pad that was stamped with information when the engine was assembled and in what configuration and also the partial VIN of the vehicle it was first installed in.
So, take a look for the pad and it's information.
Regards,
Alan