[ame="http://www.amazon.co.uk/Alfa-Romeo-High-performance-Manual-Speedpro/dp/1845840194/ref=sr_1_1?ie=UTF8&s=books&qid=1194561880&sr=8-1"]Amazon.co.uk: Alfa Romeo DOHC High-performance Manual (Speedpro): Books: Jim Kartalamakis[/ame]

I can fully recommend this book whether you are planning an engine build or not. Gives a good overall background on what is needed to provide a performance gain. Also info on vehicle dynamics.