The injector size actually does not matter if you have an engine controller such as vec or aem or can flash the computer, you can trim down the levels this way.
The way KC explained it was if a stock injector flows 30lbs at 100% and you replace them with 60lb injectors then you would trim the level to 50% and you should have the same basic flow,(i think i got that correct , well as good as I could remeber)
Now on the pump, I'm not sure what the stock one flows, but as your need for fuel increases the flow must increase at WOT, now this I cant remember as much, but the walboro 255gph flows a tad better than stock and holds presure some better under load conditions, but in a case such as mine or Toms or even the paxton or Blakewilders more pressure or flow will be needed.
Now in High hp conditions basically over 700 I think is what he said, you need a better system, but a complete system will consist of hi flo filter, regulator, rails and pump. You must incorporate the rails and filter and lines since you will be flowing at a much higher rate, such in case you put a bigger pump and no rails then you may have enough pressure but under high load conditions the rails may empty .
I would think if you are going to do a simple upgrade you could go pump only witha good filter, but in the end (as I now know) you might as well go the enitre route, then you want have anything else to worry with, you can regulate your pressure and up it when needed,
dont take any of this to heart, some of it is just what I remember from saturday, so some knowledge is actually needed.
