How to assess whether a carb is worth rebuilding?

[Praxiss454]

Hi folks,
Been a while, but after burning up my first camshaft after my rebuild I was frustrated and took several months off. New cam and lifters are in the engine and its running great!

I have a spare Rochester Model B carb, which I was considering ordering a rebuild kit for. But I wonder, how you assess whether its even worth rebuilding a carb. Some of the parts, as I understand, are not serviceable, such as the bushing/pin that holds the throttle mechanism. (i don't know the right words here). Just wondering what you all do when making this decision.

Thanks