How many horsepower can a stock SBM fuel pump support?

i wouldnt spend the money on those unbranded holley blues....every person who has says they are absolute junk so save your money and put it towards the real stuff- a holley blue isnt that expensive anyways...not sure if the stock mechanical will be up to the task of the nitrous depending on what your car is on motor and then spray, but if your dead set on going electric, check out some of the walbro pumps...cheap and reliable pumps that are quiet too