[97 Aztec]

I'm getting the nitrous installed tomorrow. How much boost do you think I can run safely on the stock fuel pump. My friend runs 100 hp of boost on a stock 91 5.0. Do the 4.6's have a better stock fuel pump than the older cars? If so do you think I can run 150hp of boost on the stock pump? If I have to get a bigger fuel pump, can I just get a Holley Blue in line or do I have to get a damn in-tank pump?? Also do I have to get colder plugs??

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97 Aztec Gold GT w/Steeda heads,TB,
shifter,headers, subframe conn. 3"flowmaster exhaust and
150 hp Nitrous Express.