Wait Untill
I wouldn't be surprised if the engine runs fine when it's all back together.
If the backfire was from a lean condition...it could easily be from a piece of trash that got lodged in a jet.
Now that the carbs been off and shook around a little...That possible piece of trash could be laying in the bottom of the bowl.
Backfire would be gone UNTILL that piece of trash finds its way back in a jet.
Just thinking out loud
Clay
PS, most common trash found is a sliver out of the inside of a rubber hose
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