with the nos, you will need more volume, but not pressure. a carb takes anywhere from 6-10 psi for the power you are going to run. you can probably run the pump you have now, but you need to get a fuel pressure regulator designed for carbs. then you can use the return line that should already be there to get the excess back to the tank.
I run a holley "red" pump. I think it runs 10 psi, and i have it regulated back to 6 psi.
hope this helps.
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