There should be a serial number on a flat space at the top of the block, just below the head. Either the right front or left rear. Engine model and serial numbers should be stamped into the block in addition to the plate you have.
By the serial number guide you can figure the year of the block. The numbers on the right of the plate are how the block is configured. Somewhere I have a list of the numbers, but can't find it. The Detroit people and tell you.