When I purchased a FSM for my 66 I was surprised the Hemi was not covered in it and was in a later supplement. But I was also surprised the 440 isn’t covered in the engine section either - but the 426 wedge was. I guess there wasn’t much advance info given to the writers of the manuals by the engine development engineers. Just curious if any left over or late 426 wedges actually made it into early 66 Furies or Polaras?