I originally posted this in the Sportster forum but haven't had any replies, maybe I should've posted it here instead?

I'm looking for a good Sportster Engine book (883 and 1200) for building, repairing, tune up, adding performance, increasing torque/HP, tips etc.

These books appear to have mixed reviews:
-Harley-Davidson Sportster/Buell Engine Hop-up Guide by Kip Woodring
-How To Build a Harley-Davidson Torque Monster (Motorbooks Workshop) by Bill Rook
-Harley-Davidson Sportster Performance Handbook (Motorbooks Workshop) by Buzz Buzzelli

Can you give any good recommendations?
Thanks