Holley 3310

I agree it is a good idea to clean and replace the items that can deteriorate. The accelerator pump diaphram and red rubber check valve, and the body to block gaskets are all vulnerable to drying out and/or some of the components of pump gas - especially since E10 became the norm.

Either of those books will help you with understanding how Holleys work and won't hurt your gray matter too much. Urich was VP of Engineering at Holley which IMO results in less reinterpretation and better diagrams.