In '65 Rally Wheels is option 691.
The 644 code for '64 does not show up on any of my reference material. It does show up in '65 as the code for a Heavy Duty Fan. It may be that in '64 the H.D. Fan was included with the 389 for the GTO, but was not an R.P.O.??? However, none of the other '64 GTO manifests that I have on hand show 644 w/382.
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