Engine ID number decoding?

[BADVELLE]

That number looks like the start to a partial Engine Code, here is how a true stock block engine code would look:

example: T0414DM

T = Tonawanda, New York (plant where manufacturered)
04 = April (assy month)(57-59 models had either 1 or 2 digits for the month, however, starting in '60, they went to 2 digits for all)
14 = 14th (assy day)
DM = actual engine suffix (in this case, it shows this engine was a 283 paired with a Powerglide trans, a/c, 4 bbl, 230 hp)

I do not, nor can I find any reference to the characters you have listed. Can he find an actual casting number on the block?? (all numbers)