I'm a graduate mechanical engineer and former Chevy Six racer, and this book taught me things I never knew - or even thought about. It gives every piece of info necessary to select and build a Chevy or GMC six from mild street to full race. It even provides the part numbers and interchangeability info, so you can't go wrong if you pay attention to the author's comments.
Also included are the strengths and weaknesses of each engine model, modifications necessary to get reliable performance and power, and little secrets of tuning that make the difference between good and great engines.
If the info you're looking for isn't in this book, you don't need the info.
VERY highly recommended!!