The advantage of dual barrel carburetors is that they keep the air velocity up even at low engine speeds allowing them to work well at a wide range of engine RPM, a draw back of single barrel carburetors.
there are more and more companies offering after market fuel injection that you might look to go that route, with fuel injection you pretty much have to add an o2 sensor and with an o2 sensor your engine is getting the right amount of fuel for a complete burn no matter the engine speed so you should see a fuel savings and even a slight increase in peek power output.
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