I am engine swapping my TBI 305 in my 89 Camaro for a Vortec 350. Got a new TBI that's good for around 400 HP. I was wonder what Id need to do fuel wise. Does my stock fuel pump need to be replaced? If so, what should I be looking for?

as another note, I have an EBL Flash II but I don't exactly know how to make a custom tune for the Vortec 350. the engine and tbi setup is good for around 350 horsepower and I was wonder if someone could help me with this or guide me in the right direction on what I should be looking for.