Small block K frame, torsion bars

On many - but not all - OE 340 K frames, there was a large washer welded to the front of the K frame. Seems this was to identify the 340 parts as they had additional welding/reinforcement over the 318 parts. Someone else may have a more definitive answer to "the washer".
I was just letting prospective buyers know, mine did not have the washer in case it mattered. At any rate, it has been sold, but I still have the torsion bars for sale.