The stock turbo injectors are about 26lbs/hr. That is really quite small for a turbo engine. The only larger Ford injectors are the 30# and 36#. To get cc/min, multiply by 10.5. This means that even the "big" 36# injectors are only 378cc/min. That is pretty weak if you are going for major upgrades. However, that doesn't mean that you need all that fuel. The best thing to do is decide on a HP level, and get injectors rated for that HP. To calculate injector size:
pounds of fuel per hour per injector=(expected bhp x .55)/number of injectors.
If you want 400hp, the the injector you will need for a 6 cylinder is 36.6lbs/hr. However, that is at 100% duty cycle. What you want is about a 40# injector for that HP level. So if you are looking for 300hp, then you will need 27.5lbs/hr @ 100% duty. You will really want the 30# injectors.
I used the 30# Ford injectors for quite a while, 'till I found out that the engine was running way too lean. I switched to 42# and the difference in power was amazing. Also, I could run more boost as a result. The 42#ers I'm using are from 2nd gen RX-7 non-turbos. I collected 6 of them at the junkyard.
Many of the guys running turbos on this and other forums are using 550cc/min injectors. This equates to about 52.38 lbs/hr. Thats pretty good. Other guys are using injectors larger than that, but they are also making the big HP #'s (600+).
Also keep in mind that if you are using the stock f/i system, the computer will not automatically compensate for the larger injectors. You will need to either dial up the AFM, or recalibrate the ECU. Good luck!!!