With respect to a v8, you might be right, but slant 6's, which is what this 65' car had, have the connections low on the passenger side, which is exactly the config for the 70 and later units. So, yes, the later unit will fit, and be appropriate for the 66-69, and one could argue, 63-65 as well, with a slant 6.
Your point is well taken though as it refers to a V8. If I'm not understanding this correctly, please correct me.