Carburetor (BBD) - new or rebuild?

Yup. I have a pile of them, pretty basic carbs, really.
I think I'm gonna "borrow" the NOS one from my /6 (which is really spec'd for a 318 anyway) and stick onto my b body fury since its lean burn is going wonky and needs to go away, and my original carb that's still on the fury lacks a vacuum advance port for the distributor I'm gonna have to use to run regular Mopar electronic ignition.
I have a different (4 bbl) manifold and carb already that's destined for that fury but I wanna get it out and drive it this season yet, and besides the truck that the /6 and NOS BBD are in is in "bodywork jail" anyhow right now and since I've run that BBD, sitting with last year's gas isn't helping it, either.