Carbs, Unlimited, in Washington, might have the carb parts you might be looking for. Here is their website, and contact information.
Their telephone number is: 800-994-CARB (2272) and their email is: email@example.com
. A good contact would be Steve, who gave me permission to list their company on our Forum. They list Holley's, Carter's, Motorcraft, and Motorcraft 4100's that they have parts for. Check out their Parts section.