The best one i've found to date, is the Anderson Ford Motorsport big pump kit.
www.andersonfordmotorsport.comhttp://http://http:// just go to your year mustang on the side, fuel delivery, and fuel pump.
with the inline pump and 50lb injectors it can supply the fuel needed on a 255lph pump and stock lines

(upgraded fuel lines and i am running 60lb injectors with it) i've got one and installed it which was easy because it's vehicle specific... Also it's a good idea if you are running a supercharger and nitrous to go ahead and step up to 42lb injectors for the fact that you always want to have more fuel.
i've wrote this on the How-To page that tells you how to figure injector size needed by hp and several other things. It's got the information you need to size your injectors properly. Hope this helps on that part.
http://sn95forums.com/index.php?topic=35563.0