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

Demonracer said
Depending on the year the NOS carburetor was built, it could have been sitting on the shelf for up to half a century. Slantsixdan is on the right track, just if it were mine I would locate & purchase a rebuild kit just to have on hand in case it needs a rebuild. That way if it leaks, you have the kit handy instead of having to scramble around trying to find one.
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Of course, having a rebuild kit around is always handy just in case. I forgot where the last time I ordered one was for the previous BBD but I am going to get on that. Either way the NOS carb is here for this weekends project, nowhere to go but maybe the parts store if the new battery terminals don't fix the problem on the (Ford) daily driver.