im currently building an engine up from various diffrent bit and pieces.
originally was built for twin carbs but i have converted it to efi.
one of the last things i need is a set of injectors but im not sure which ones i should be going for as i dont play with efi that much!!

most injectors come with sizes eg 380cc,440cc or colours eg red,green.
is there a rule i should be using??regaurds to the power i want to be getting??

are the colours all the same or can you get 380reds and 400reds or are all colurs the same size??
are some injectors better than others??eg spray pattern etc

any help greatly appreciated