Changing the fuel pump on a stocker is a necessity.
The originals barely supported the stock HP.
It is a job you only want to do once as it's not much fun.
Since most aftermarket pumps are about the same price the TurboBuick vendors sell the biggest drop in cost effective unit in a kit for about $100-$120 or so.
It does support the 550-600HP, motor.
It allows you plenty of room to grow with one pump install, and there are people with heads and cams. cars that actually need 2 of them flowing over 10psi. boost.
These cars can make a lot of HP and need the fuel, but you only need to change the pump once for many bolt on combos.
And the units they sell are proven pumps over time, another bonus.
Sourcing something from Summit or Jegs isn't very easy nor a drop in.
The kits from the Turbo Buick vendors are a no-brainer.
If you are good electrically you can make your own hot wire kit, if not the price they charge for a plug and play unit is also reasonable.