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1966 289 3-speed
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I thought this would be better answered here.

Anyone know the physical difference between Autolite 2100 C6DF-A and C6DF-E? Both were for 289s with 3 speed manuals. I know the the E had Thermactor Exhaust Emission Control System and the A did not. But are they different inside? If so what's different?
 

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Jetting, boosters and calibrations are different. See the Specifications chapter in the Fuel System group section of your shop manual.
 
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