The basic part number for all Carburetors is 9510, use this number in conjunction with the carburetor numbers listed below.
For the year 1968, I cannot find information about the 428 engine used in the Mustang. Also for 1968, the 390 mustang is listed as only a 4 barrel version, however I was told by one person he had a 2 barrel version of the 390 in his 1968 Mustang I have not been able to verify casting codes on the engine, so I am sceptical. Ford did put out a 390 2 barrel carburetor in 1968, but as far as I can tell, it was only installed in Fairlanes, Montegos and Cougars. The Cougar version used premium fuel. As such, I have included a 390 2bbl carb in my tables but have used the Fairlane/Montego data as its base.
Also in 1968, Ford switched from the venerable 289 to the new 302. However, there were some early 289 engines in the first production runs so I have included the 289 carburetor specs.
The autolite 2100 carburetor has two versions, one for the small block and one for then big block. The main difference is the venturi sizes. They are tuned and rebuitl about the same.
The 200 CID engine used an AUTOLITE 1100 carburetor. The standard transmission used a Thermactor polution system and a C8OFA-A carburetor, while the automatic used IMCO and a C8OF-B carburetor. Carburetor specs can be found by following the individual links. The 1100 carburetor fuel level in the bowl is a very critical adjustment.If the fuel level in the bowl is too low, a lean mixtureis achieved. If the bowl level is too high, a rich fuel mixture occurs. The entire calibration of the carburetor is disturbed if the fuel float level is not set as specified. One of the critical factors in keeping the fuel bowl gas level correct is having the correct fuel pressure at the inlet. A too high or too low pressure creates a high or low bowl fuel level.
Both the 289 cid 2bbl engine and the 302 CID 2bbl engine used an AUTOLITE 2100 carburetor. The standard transmission used a Thermactor polution system and a C8AF-AK carburetor, while the automatics used IMCO and a C8ZF-G carburetor.
The 302 CID 4 barrel engine with a standard transmission engine used an AUTOLITE 4300 carburetor model C8AF-M, AM. The automatic used IMCO and a C8OF-U carburetor.
The 390 CID 2bbl engine used an AUTOLITE 2100 large block carburetor. The standard transmission used a Thermactor polution system and a C8OFA-A carburetor, while the automatic used IMCO and a C8OF-B carburetor. Carburetor specs can be found by following the individual links.
The 390 GT CID 4bbl engine used a Holley 4150C carburetor. The standard transmission carburetor model C8OF-C used a Thermactor setup while the automatic transmisson carburetor model C8OF-D used an IMCO polution system
The 427 CID 4bbl engine used a Holley 4150C (C8AF-AD) carburetor in conjunction with a Thermactor setup and an automatic transmission.