It appears you have the M103.983 engine, which is a 3.0.
http://en.wikipedia.org/wiki/Mercedes-Benz_M103_engine
VIN WDBEA30D5KA984104
Model 300 E
Chassis 1240301A984104
Engine 103983 12 163379
Transmission 722358 03 223626
Order 0 9 704 01099
Delivery date 05.04.89
Dealer United States (USA) (704)
Interior mb-tex black (171)
Paint
040 black (T) (с 01.01.1963)
Options
222 right front seat, electrically adjustable (с 01.11.1978)
240 outside temperature indicator (с 01.03.1982)
241 left front seat electrically adjustable with memory feature. only applicable to w 210 when installed in conjunction with code 275. (с 01.03.1983)
286 luggage nets on front seat backrests (с 01.01.1962)
412 electric sliding roof with tilting device (с 01.07.1983)
420 automatic transmission, floor shift (с 01.01.1963)
430 headrests in the rear (с 01.01.1977)
446 tempomat (cruise control), steering column, electrically adjustable, and airbag (с 01.02.1980 по 31.10.1993)
461 Unknown code
491 USA version (с 01.01.1963)
519 Becker radio Grand Prix electronic cassette - USA (с 01.08.1980 по 30.11.1990)
Becker radio Mexico Grand Prix, electronic (USA)
524 paintcoat preservation (с 01.01.1964)
531 automatic antenna (с 01.01.1963)
543 sun visor with vanity mirror, illuminated, left and right (с 01.11.1978)
551 anti-theft warning system (с 01.11.1978 по 31.03.1998)
570 folding armrest front w202/210 stowage box front with armrest (с 01.04.1970)
front folding armrest w202 - housing at front with armrest
588 automatic climate control and electric window lifters (front and rear doors) (с 01.01.1977)
593 heat-insulating glass, all-around, heated rear window pane (single-sheet safety glass), band filter
green heat-insulating glass all round, heated rear window, single pane safety glass - tinted strip (с 01.01.1972)
600 headlamp wiper/washer (с 01.08.1971)
611 courtesy lamps for front and rear doors, with W124 also for central doors/W202 front doors only (с 01.11.1978)
639 elimination of first-aid box and warning triangle (с 01.08.1977)
640 aluminium disc wheels with radial-ply tires (с 01.10.1969 по 31.12.1989)
809 Change of year of model, last figure shows new model year