NOS carburetors. What issues to be aware of if any?

Found a NOS 2bbl carburetor Carter BBD for my super six. I've had issues with all 3 of the used ones I've rebuilt. I'm thinking NOS should be a good route. What does everyone think? Should I rebuild the NOS carb? Could there be an issue with the old paper gaskets? Accelerator pump? Thanks for looking and any help is much appreciated.
I would buy it and if it looks good from the outside run it.
It has been 10 years ago that I purchased a NOS Holly 2280 to use on the slant six D150. Put it on and ran it. Other than going through the carburetor set up, adjusting idle air and adjusting the choke, the carb was fine.