Carter/Rochester. Either one could have worn throttle shafts/bores. These old carbs are relatively simple, as Jerry says. This is why, sooner or later, you need to rebuild one or learn to examine the workings a little. What kind of shop would rebuild a carb that can't be rebuilt? What is easier than a 1 barrel? If carbking will sell you a carb that is suitable for your motor, you may consider purchasing or having yours rebuilt. Click his link to inquire. He has some "trading" options that may save you money if you have any of the items.
