It doesn't matter whether you use aux fuel or injectors+hpfp. Fuel is fuel, like Jabbit said.
Your issue will be making that much power with the hybrid. I don't think I have even tuned a hybrid to 340whp and I've tunes probably close to 100 all over the country. The issue is, that to make excess of 300whp you need to run higher boost than Ron warranties the turbo for. I get guys all the time that want 300whp, but then tell me that boost is too high and I'm voiding their warranty. Well which is it? Lol. Do you want the power with no warranty or the warranty and fall just short of 300whp.
I hope this helps