Fuel systems are basic and simple Fluid Dynamics.
Irregardless of WHAT or WHO'S system is used to get fuel from the tank to the carb the goal is to use or put together a system that: Gets the fuel there,
1. at the correct pressure
2. at an adequate volume (different power levels require different Volume's)
3. without air bubbles/aeration (Carbs need a solid slug of fuel)
4 Without raising the temperature of the fuel
5 That is not effected by G Forces of acceleration
If you have a system that does all of the above you may not see a gain by making changes.
If you have a system that is 2 out of 5 chances are you might see some change
Bolting on parts without a basic understanding of the Fluid Dynamics and what the carb/engine combination needs is just a cut and try method and usually just confuses things.
It helps to know what HP & the BSFC of your engine combination and calculate how much fuel system you need. Most N/A engine BSFC's run between .40 to .55 depending on the "State of Tune". Fuel delivery is extremely critical in selecting injector sizes. Blown engines operate at different BSFC than N/A engines. There are several on line calculators you can use to size you fuel requirements. This Tech page is just one and it touches on a few basics.
http://www.sdsefi.com/techform.htm
nhramnl Do a little research and figure out what you need then get it on your car or work with someone that understands the in's and outs of fuel supply.