You'll find the kit to rebuild it at Mikes carbs( carburetor-parts.com) or your local Napa will have it too.
Get yourself a lot of carb cleaner and clean every hole you can see, spray it with carb cleaner, then blow it out with air, or soak it in Chem -dry, but this stuff is nasty on the body but it'll clean the carb.
and she'll run good for you and will be dependable too.
I own 1 newer one and 3 older ones Afb's and they work. One thing check to make sure idle mixture screws aren't pitted if they are they do make them, Walker Products sells them.