1966 3 speed manual trans problem. Help!

I paid $50 for my 65 FSM probably 25 years ago when I spotted it at the Mopar Nationals. At the time I don’t think they were being reproduced. My wife’s comment at the time - “ $50 for a book! Are you crazy!”
I use that book at least 2-3 times a week - best $50 investment I made for my Dart’s!!