If it is the butterflies that are stuck; then the best method is to remove the throttle body from the rest of the carburetor, and apply heat to the cast iron with an acetylene torch. Heat the cast iron evenly. DO NOT QUENCH IN WATER; let it cool naturally. Once it has cooled, place the throttle body in a ziplock bag in your freezer overnight. The next morning, place the cold throttle body in diesel or the penetrating oil of your choice. Let it set a few hours and then gently work the shaft.
Don't use this approach to the other (zinc alloy) body parts.
Jon.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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