That number is probably a casting number, it isn't an engine number. The engine number will be stamped into a machined area of the block. It seems to me that its above the pan around the alternator, but we hardly ever view one anymore as the EPC gives the engine # and most of the other numbers through the chassis number and the data card.
List your chassis number and one of us will look up your engine number... then you can find it on your engine and verify originality.
Bosch Master, ASE Master, L1
33 years MB technician