I am not aware of a 389 HO. In '64 the cam was the same for both the four-barrel and the tri-power. I don't remember the number but it was similar to and replaced by the 067 in 1965. In 1965 and 1966 the automatic tri-power cars all had 067's, and the stick tri-power cars had 068's. The 744 came out with the 400 HO in 1967, with a Quadrajet.
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Jim
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