Welcome back.

A word of advice here. Your car (240s 1983 through 1987) is afflicted with the bio-degardable wiring harness insulation disease. That can cause a plethora of problems, so buy no FI parts until any wiring issues are resolved.

Look at the insulation on the four wires coming out of the large gray connector on the firewall, and on the two thin wires connecting to the alternator and the nearby oil pressure sensor. While it is possible that your car's wiring harness has been replaced, have a look.

I think there is an engine code in the VIN. Post it and someone will tell you.

If your car is unchanged from stock, it is the first year for the B23 engine and the "LH II" FI system. The intake manifold and "plumbing" on the right side of the engine is very different from previous engines. If I recall correctly, the 1975 (I had a 245DL) was the B20, a vertical-block pushrod engine.

Your B23F is a tilted-block single-overhead-cam engine, using the LH II control system. That engine and FI system stayed, with very few changes, in the 1984 240s.

In 1985 came the LH 2.2 and the B230F engine. The LH II became LH 2.0 (or 2.1, I forget). The B23F looks a lot like the B230F, most obvious difference being that the B23F crank drive pulley uses the split-sheave tension adjustment, the B230F does not.

The 1985+ other visual differences are in front drive and driven pulleys, and and adjustors, and the rotary a/c compressor. Your car should have the York "Cube" a/c compressor.

Hope this is helpful.

Good Luck,

Bob

:>)