500cfm Summit carb on 318

From what you have stated above and the type of driving you do I will agree.
Yes you will get better performance with a larger carb at high rpm full throttle.
Also if any work is done to the 318 if you are looking at performance.
A stock 318 2bbl is maybe 350 cfm .
Now this is just me. Not wanting to start a fight. My favorite carb is the Edelbrock 500 cfm.
The carb for general use. I used a 500 on engines as large as a 451 stroker. Street driven.

I say keeps me out of bars and chasing wild women !!
I understand what you're saying completely. However, how many people spend their time in a street car more than 50% of the time 4000 RPM of higher? That's where a larger carburetor will be of benefit for a smaller engine. I'm not trying to start a fight either, but that's a 100% fact for a street car. This is a street car we're discussing, is it not?

I want to come back and add, I agree with your assessment of the stock 2 barrel. 350CFM is probably right in the ballpark. So, since we agree on that, then that means a 500CFM four barrel is a pretty healthy upgrade on a mild or stock 318. Right? RIGHT? lol We're simply so USED to reading and hearing anything 600CFM and above relating to "performance" that anything smaller sounds whimpy, and that's not necessarily so.