I wanted to do some work on the Ligambi article, but all Blood and Honor does is say that Scarfo didn't initiate him when he did Phil Narducci and Nicky Milano. I also gave my mother my copy of The Last Gangster so I can't check there for a date.
Genoveses: 72.4
Luccheses: 39.4
Gambinos: 37.0
Bonannos: 33.6
Colombos: 11.8
Weren't those the same numbers you gave for IQs?