Do I really need this fuel pump?

[1Low S-Dime]

Recently I have installed an Edelbrock Performer Intake Manifold, Performer Camshaft, Edelbrock Tubular Exhaust Headers, and a Holley 670 CFM Two Barrel Throttle Body on my '90 S-10 4.3L. When I purchased all of these parts, I also purchased a Venom Hi-Flo fuel pump.

My question is do I really need to replace my current existing fuel pump with this one or can I keep the stock one? If I can keep the stock one (hopefully), I can send this one back and get my money back, and it'll save me from dropping the tank.

On a side note/question: Edelbrock says not to use 2 inch bore throttle bodies on their intake manifolds. With that in mind, I asked a mechanic friend about that and he said that "no, it shouldn't be a problem", of which I kind of thought about it and realized that the manifold just re-mixes the air/fuel deal, which he said "pretty much". So, does anyone else think it's a problem that I have this new Holley TBI unit with a 2-inch bore is a waste of money? (Pretty much my stock one is stuck on the old manifold due to a torn off head on one of the TBI bolts)

Any answers/suggestions are appreciated.

[jackass#1]

the stock pump only puts out 9 to 14 psi(which is good for stock tbi and intake). the new tb and intake may need more. does it specify in any of the installation paperwork on fuel pressure?

[1Low S-Dime]

No, the instructions never said anything about adding in a new fuel pump. And, I found out that you should keep the stock TBI unit, so from the sounds of it, the stock fuel pump will do just fine.

[jackass#1]

was it because of the new intake that you couldnt use the holley?

[1Low S-Dime]

Yes, I asked a mechanic. He said that the intake was designed to utilize the stock unit and that I will probably just waste gas with this oversized one.