[WarrenG]

According to a spec sheet dated 01 Sept 1964 issue (in a Road&Track article) the 289 was available in four "acceleration" packages, Stage I-D thru IV-D, 271, 300, 325, and 380 HP respectively. Most of my references are presently packed for an upcoming move, however I remember reading somewhere that the typical race version of the 289 put out 385 HP.