You are seeing why we recomend to avoid commercially "remanufactured" carburetors. They get an acid bath which degrades the threads everywhere, not just for the jets.
The throttle body needs primary bushings, it's OK if the secondaries have a bit of side play, as they seal tight on the huge throttle plates.
Best to order what you need by phone, we have everything in stock for that unit, including the correct jets/metering rods, quick release choke pull-off, etc.
740-397-2921. 8am-5pm M-F EST...thanks....Cliff