A 2000 Lincoln LS did not use a "305" engine code. The 305 cubic inch engine was a small-block Chevrolet V8, not used in Lincoln vehicles.
The 2000 Lincoln LS came with either a 3.0L V6 or a 3.9L V8. There isn't a simple numerical "engine code" like a "305" in the way GM used those designations. You'd find the engine details on a sticker under the hood or in the owner's manual.
