The 1970 1/2 to 1981 Definitive Firebird & Trans Am Guide is now available on Amazon for preorder! This is written by Rocky Rotella.
I have the 1967-1969 guide also written by Rocky and it is the most detailed car book I've ever read to date. I suspect this edition will go into as much detail as the 67-69, which will make this a good book for all of us 2nd gen owners.