The difference will be, you'll be making "safe horsepower". With my stock pump and stock FP regulator, I could only get 53 lbs of fuel at 15 lbs of boost. Everyone knows that this is NOT enough. I now get 53 lbs of FP with only 8 lbs of boost with my Walbro 340 and billet FP regulator. 60 at 16 lbs.
Fuel pump and regulator should be one of your first upgrades. It's hard choice for some because everyone wants to buy "go fast" parts. If you don't supply the motor with enought fuel, you'll be rebuilding shorthly thereafter.