I bought this book thinking it would teach me how to super tune and modify a holley carb. It does not. This book includes a history of Holley carbs, some old photos, some weak humor, and that's about it. There is not much tech in this book at all. There are some general, not very accurate, guidelines to follow when selecting a carb for your application (which can all be had for FREE by calling the Holley Tech line), and lots and lots of examples of what NOT TO DO, but that isn't helpful either. However, for someone trying to put together a carbed combination for a street car or a weekend racer, there is next to no useful information in this book, and there is none that isn't available elsewhere. Waste of time. Waste of money.
Ironically, there is more useful tech applicable to Holley carbs in "How to Tune and Win with Demon Carburetors" by Ray Bohacz that Amazon also sells. I'm not joking, its a good book, even if you have a Holley rather than a Demon.