From everything I've read over at LS1tech, you should be just fine on the stock pump with a 100 dry.
With 42#ers, I would think you wouldn't be anywhere near max duty on them, and adding only a 100 shot will not raise it that much.
If you're worried about the stock pump, you can always add a boost-a-pump Munch.
I would personally wait to see what the A/F is after you hit the juice before I went tearing into the fuel system.
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'98 Pewter coupe. A little of this and a little of that..... 
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