Decode this!!!! Never seen one

Dana67Dart said

IIRC it is a tag off of a warrantee engine, or a "crate" engine of the day

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Well ya but what does 03 30 model mean?
The guy told me he had an AAR Cuda blew the motor under warranty that replaced the bottom end and i think the tag ca.e from that. But I don't know what the 03 30 code means