There are two drain plugs on the engine block. They sit pretty low on the block. Approximately three inches above the oil pan flange. Assuming you are talking about 3.0L of course.

Passenger side: just above the starter close to bell housing flange.
Driver side: toward front just between the A/C bracket and engine mount.

In both cases, the look and feel like bolts protruding from the engine block.

89 Raider - V6, Automatic, rear LSD, A/C Retrofit, Cruise Control Retrofit.