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Take a look at my sig for my current mods and then let me know what injectors you think I can get away with. I'm currently running a duty cycle of 95-100% on my stockers, this is not good. Stock LT4 injectors are 28lbs/hr, is anyone running 30's? I don't want to go up to 38's if I don't have to as they're much more expensive.
You should not be coming too close to maxing out the stock 28#/hr injectors with your mods. If you really wanted to upgrade though (I would not if I were you), the best option would be the SVO 30#/hr injectors. I am running a set of them and they are at anywhere from 85-95% DC at 6300 rpm on my setup and that is making around 12.5:1 air fuel. You will need a program change to swap injectors.
I don't think it will make much difference to the pump if you up the pressure to 48 from 45psi. If there is any doubt, you can always throw a Walbro in there for ~$125 for the part.