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If you post a picture of the passenger side of the center carb, I might be able to tell you more about the center carb number. I need to see if the main body was drilled from the factory for the vacuum tube or is it plugged up with some. It will be real close to where the vacuum tube comes out...
Once the air horn is removed like this one is, any numbers are irrelevant. That 4792 is a 340 metering block for sure, but they only put the list number on the metering block on the later issue carbs, not the oem installations. An original 4792 metering block would only have the 6610 stamped on...