Whenever you get rebuild kits or service parts for a carburetor, its darn near mandatory to present the ID tag information for that particular unit to get the correct kit or parts. I know, sometimes a tag isn't always there and the counter guy at the parts store needs to go the "long" way in looking up the application and hope its correct. Sometimes he's successful that way, sometimes not. In the case of the throttle shaft arm being to short, most of the time, a new throttle shaft isn't needed. The bore wears before the throttle shaft does, so if it needs throttle shaft work, the bore needs to be sleeved, and the same throttle shaft can be used unless the shaft/arm assy. has been damaged or worn beyond repair.
To add to Dicks suggestions, make sure you have the throttle blade installed the correct way. I've come across some carbs that came in for rebuild that the throttle blade was incorrectly installed. Of coarse someone was already there before it arrived to me, but in some model carbs, its easy to install the blade incorrectly. The tapered side of the blade needs to be flush against the throttle bore. If its in incorrectly, you'll never get the engine to idle down.
As far as model numbers, if its a small bore Zenith (which on a C it should be) the tag would be riveted to the fuel bowl. Two sets of numbers will be stamped in that tag. Outside number closest to the edge of the disc or tag will have the Allis number. The inside number closest to the rivet will be the Zenith ID number. ie- 9707 or 9707A. If the carb is a small bore Marvel, the tag will be riveted to the side of the fuel bowl area. The numbers on a M/S carb usually start off with TSX-XXX then three digits. ie- "TSX-514" Large bore Marvels usually will have the ID tag riveted to the throttle bore in front of the carb. Usually the tag is square with its ID number. ie- TSX464 TSX950 etc. HTH
Steve@B&B
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