You are correct, on the dual plane manifold they see minimal differences. On a single plane intake they said this though- “The power graph revealed that the FiTech was able to improve power over the carburetor basically throughout the entire range from 3,000 to 6,000 rpm. As you can see from the graph, this represented a 5 to 7 lb-ft of torque gain nearly throughout the entire pull.”
There are a multitude of factors in carb vs efi tests. I will compliment that test though, as they recognize when their tuning effort or experience is above that of an average user, and try to keep it close for a fair comparison.
You are right, carbs can often go on sale just like fuel injection. Though it is rarer for FI to have such a deep discount.
Many cite the ease of rebuilding a carb, but that comes from practice and experience. Especially tuning one. Self tuning EFI has the capability to keep many classics on the road after the ability to tune carbs is lost, or the alcohol content renders classic carbs unusable.
I love the four single-barrel Rochesters that sit atop my flat-six. I wouldn’t trade them for the efficiency and ease of use of fuel injection…yet.