If your worried about that throttle shaft there are a few things you can do
1/ make some brass bushed , I got thin wall brass tube from a model engineers shop with the ID the same as the throttle shaft dia , and used a few drills to ream out the carb body . I actually hammered the drill right into the body on one side and used the point of the drill to center it on the other side of the body , put the drill shank in the vise and rotated the carb body . It takes a nice clean sliver of metal out and with the correct sized drill used last the bush was a "press it in with your thumb" fit .
2/ find or make a thin plastic washer thats a tight fit on the shaft and assemble so that the washer bears against the carb body , this dont fix any slop but it does stop it from sucking air in . I saw a spring loaded version of this while bushing a carb but I cant remember which one , twas either a 390 cfm Holley or a weber 32/36 DGAV .
I had issues with an inconsistent idle but it was because ( I suspect ) due to shaft /body wear the edge of the throttle plate landed in a different position in relation to the idle transition orifices in the carb body .
1/ make some brass bushed , I got thin wall brass tube from a model engineers shop with the ID the same as the throttle shaft dia , and used a few drills to ream out the carb body . I actually hammered the drill right into the body on one side and used the point of the drill to center it on the other side of the body , put the drill shank in the vise and rotated the carb body . It takes a nice clean sliver of metal out and with the correct sized drill used last the bush was a "press it in with your thumb" fit .
2/ find or make a thin plastic washer thats a tight fit on the shaft and assemble so that the washer bears against the carb body , this dont fix any slop but it does stop it from sucking air in . I saw a spring loaded version of this while bushing a carb but I cant remember which one , twas either a 390 cfm Holley or a weber 32/36 DGAV .
I had issues with an inconsistent idle but it was because ( I suspect ) due to shaft /body wear the edge of the throttle plate landed in a different position in relation to the idle transition orifices in the carb body .