PastorMatt - At very best that YF is a "Frankencarb" (I really think from the pictures it is a fake, but would have to see it to be sure). In any event DON'T USE IT!
A few comments, with absolutely no offense meant to anyone:
(A) I do not remember ANY Carter YF carbs with a factory slotted throttle body, they are either drilled for 2 11/16 or 2 15/16 inch centers. Some of the universal Carter type WA-1 did come with a slotted TB.
(B) Below is copied from my website:
Carter numbering systems. Three different types of numbering systems are found on Carter produced carburetors.
(1) On carburetors built for Chrysler Corporation, a series of 3, 4, or 5 letters and numbers; i.e. EV1 or D6H2.
(2) On carburetors built for Ford Motor Company, the “Ford” numbering system which is “lnll – l(l)(l)” or letter, number, letter, letter dash letter (possible letter) (possible letter) i.e C5VF-A. This system is codified in that the first letter is the decade (B=1950’s, C=1960’s, etc.); the number is the last digit in the year; the 3rd and 4th letters (before the dash) represent the vehicle model (VF=Lincoln); and the letter or letters after the dash are a modifier which distinguishes the exact application. Thus in the example C5VF-A, the carburetor would have been the first application for Lincoln in the year 1965.
(3) The traditional Carter numbering system which consisted of 1, 2, 3, or 4 digits; followed by the letter “S”, possibly followed by another letter. It is extremely doubtful that any of the single, double, or early triple digit tags will appear; as they were produced before 1930 and were constructed of red cardboard. The metal tag appeared about 1930 with tag numbers of about 300s. The 4 digit tag appeared in 1952, and was continued on until the end. The letter S and following letters, when present, have caused much speculation (mostly incorrect). In Carter’s terminology, an individual part such as an idle mixture screw was a single part; whereas two or more individual parts sold together such as a needle, seat, and gasket were sold as an “assembly”. Carter used the suffix letter S to denote assembly. Since all carburetors are composed of multiple parts, the letter S was appended to all carburetors using the traditional numbering system i.e. 938s. If a significant engineering change was made to the carburetor, the letter “A” would be appended to the S (i.e. 938sa). A second change would have the letter A replaced by the letter B (i.,e. 938sb). The highest engineering change of which I am aware is 4 i.e.938sd. Contrary to popular belief, the S DID NOT mean standard transmission, nor the SA automatic transmission.
(C) ALL genuine 2100s carbs will have the "s" stamped after the 2100.
(D) As mentioned by others, the pictured throttle body is from a 216 YF.
(E) SPECULATION: Some of the earliest YF's did not have an identification number stamped, anywhere. Why, I don't know. Possibly sold through J.C. Whitney??? Other early YF carbs had the ID number stamped where yours is stamped. So where yours IS stamped IS a valid location. Your bowl appears to be one of the early bowls. 235 carburetors are MUCH more valuable than early unstamped 216 carburetors. Metal stamping sets are readily available.
EDIT: The 2101s has "1121" stamped on the face of the flange; the 2100s has "1127" stamped on the face of the flange. The throttle arms, and linkage are different.
Jon
