Tuning SU Carburettors Including Full Needle Charts, ©1968 Speed and Sports Publications Ltd Acorn House, Victoria Road, Acton, London W.3
This book is out of print and shows up from time to time for over a hundred bucks. It is commonly available as a pdf. I created my own pdf after someone sent me what I thought was a xerox of the actual book but is more than likely a printout of the more common pdf. Anyhow, this book is an excellent resource explaining how to tune your carbs, repair them, and how to get the most out of them. It can be a good way to get aquatinted with how SU carbs work. The PDF below was OCRed so it is searchable.
©Seth Jones 9/1/2011