7041263 is a valid Q-jet p/n. They are a unique carb, as they are rated at 800 cfm and only have one boost ring on the venturi. The 7041263 has a lot in common with the 71 455HO carbs (7041267, 7041268, 7041270, and 7041273), which are also 800 cfm and only have one venturi boost ring. These carbs are the only Q-jets I'm aware of with only one boost ring.
I have a 7041263 on a 71 400 4-spd engine I have (WK code). They're out there, but I suspect many have been bought up and restamped with 71 455HO numbers. They're also not very cheap.
Mike
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