You should be able to find complete engine and carburetor specs at NHRARacer.com

Another source of information would be ClassRacer.com.

I have a friend who raced at 67 they had purchased from Don Grotheer. They eventually switched it from a four speed to an automatic and I don't remember having to change carbs. They raced it at NHRA National Events so I think they would have been bounced if there was a problem in tech. They actually set a National Record on speed but I don't remember if that was with the four speed or automatic.