Decode this!!!!

I never seen one of these i just found it not 30 minutes ago in a box.
The guy had an AAR blew up under warranty and was supposed to have got a new short block. I went to buy the engine and the bottom end was not AAR. I read That they ran out of the AAR blocks and used regular 340s? So I bought all the mopar stuff he had! All Cuda stuff.
But anyhow what do the numbers mean for model?

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Author: Ratvon