All post 1981 W123 230's were injected - K jet.

June 1980 saw the introduction of new 4-cylinder petrol engines (Type M102). A new 2 litre four with shorter stroke replaced the old M115, a fuel-injected 2.3 litre version of this engine (in 230E/TE/CE) the old carbureted 230

1980/81 the carbureted 280 versions went out of production; the fuel-injected 280E continued to be offered.

I had a 1978 M115 230 carburetor W123 - it was a slug.
230e E for Einspritzung (fuel injection)