anyone know of a guide that tells what size hose you use with these. all these numbers confuse me. Also what do you need to connect a rubber hose to one of these fittings? I understand what I need for my fuel pump and such but what about like when you need to run a rubber hose from your gas tank?

I saw several guides by all the main pump guys. Holley, Edlebrock abut I liked the Mallory "fuelish tendencies" site

http://www.centuryperformance.com/fuel.asp

It suggests matching pipe vs AN and good line sizes for applications.