What you describe is fairly common in carb throttle bodies from some parts of the world. I have never seen cast iron bases that could not be restored for acceptable performance. Yes, sometimes it is necessary to replace the throttle plates, but only if the edges are pitted and/or the flat surface is very badly corroded. But, with DAG 213 and some judicious polishing, the throttle bodies can be made whole again.
Regarding the throttle levers being loos, this too can usually be fixed with red Locktite and the right sized punch and hammer. This is, however, risky until you have done a few and know exactly how to set up the pieces so they are not damaged by re-swaging the end of the shaft. If the end of the throttle shaft is damaged, a 8-32 screw and drilling/tapping the end of the shaft can nearly always remedy the problem.
If you want, I'd be happy to restore the bases for you. PM if you want to pursue that.
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