I have NO DOUBT that your carburetor is running rich.
The carburetor you have is a 1969 1.23 venturi carb which flows appox 352 CFM WAY WAY TO MUCH FOR THAT 289 engine.
The ORIGINAL application for your carburetor is a 1969 Light Duty Truck (F-100/F-150) with the 360 FE big block engine.
NOT ONLY THAT but when the generic rebuider rebuilt it they installed richer jetting since your carb was supposes to ONLY have 54 jetting not the 56 that yours have.
By comparison a 1969 bronco (67 would have been very similiar) only had a 1.08 carb flowing only 287 CFM and had 48 jetting.
Two perfect lessons here:
NEVER, NEVER, EVER buy a rebuilt carb, instead rebuild yours and save money and get the job done right rather than increasing your problems and ending up with a "generic" carb that runs crappy on your particular application.
And ALSO IF YOU END UP WITH A REBUILDER MAKE SURE IT IS TOTALLY CORRECT FOR YOUR APPLICATION AND IT HAS BEEN REBUILT CORRECTLY NOT FULL OF CROSS MIXTURE OF PARTS JUST TOSSSED IN TOGETHER.
Sounds like its time to start over, fortunatley there are thousands of 1.08 venturi 2100's out there and they are not the expensive. If you are not looking for a numbers matching one you should have lots of options and a diverse price range depending upon what you want to do.
End the confusion replace your carb.
Good Luck,
Bill White
White Automotive
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