Notice that song book quote is about the year 1963 - not necessarily about the song 1963. Could be just a comment about the events in the year of the song title?
As has been posted (exactly) before:
The comments about 1963 and JFK was just Barney talking generally about the year 1963, and JFK, not the song. There was an online streamed interview at the time Get Ready was released (an interview from GetMusic. To hear the interview just follow this link http://www.getmusic.com/calendar/audiochats/neworder/index.html and click on Hear The Chat Now) and a fan emailed in the question about the lyrics to 1963, and Barney just said it's a song from the point of view of a wife, being shot by her partner Johnny, then him going on to get another wife. The interviewer was a complete twat. Barney explained "1963" lyrics, saying that is a fictitious story about a man who kills his wife and the guy went "It sounds like an Eminem track to me". Really embarrassing.
The description he gives in that book doesn't marry up with the lyrics, as that would mean JFK shooting his missus, then remarrying, wouldn't it?
Andy