A Nov. engine build would surely be the next model year, but his is the last day of May and i believe the cut off on the car builds were in very late July. I may be wrong, but it will be cool to find out...:D.
Just for clarification my car was built in nov.I haven't looked for the engine build date.Now you have given me something to look at with the balancers.
Your Cuda should definetely be forged if that's the original block. The cast 340's were used in the 73' models only as far as i know.