There's a new reference book just released that I can highly recomend. Anyone wanting to build an F16 can find this book indispensible covering the Viper from nose to tail. It's very well organized with numerous clear all color photo's. All Blks. and variants are disscussed in depth to clear up confusion on differences.
The book is called "The Modern Viper Guide, the F-16C/D Exposed" by Jake Melampy. It's available here. www.reidairpublishing.com