318 MAX fuel economy builds?

Here are a couple pics for the carb guys to disect. One of these boosters is a drop leg one is a annular discharge from a 1906 and the other two come from the off road versions which are different and they claim are as close to FI as you can get. I have a 1916 on my car. #1 1406 #2 1906 #3 1916 #4 1913 800 cfm.

What are peoples thoughts and experience on these different booster methods?

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