Check the throttle shaft for leaks first.
The bushings wear out and are un-rebuildable except at the factory,
Ford Carb
Motorcraft CT-207A
Hygrade - 901
Echlin - 2-5579
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Holley Carb
Motorcraft CT-223B
Hygrade- 540
Echlin- 2.5462
Check here
www.rockauto,com