Some of us..plus some not on this board are working on a book per se. The books currently available for purchase that detail 67-69 Firebirds have so many errors that I literally put it down after finding and highlighting 86 errors and another 15 to 20 in the Firebird Red book.
Anyone can slap information together, find a publisher and charge $20-30.
As they say...measure twice...cut once.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.