IMO,,, I think the reason the 64 is not liked as much as 61-3 and 65-6 is it lost most of the "sport" look in flavor of a more "luxury" look.
It`s a fine looking car, stand alone, but when you compare it with the others thats when it`s appeal loses out to most.
Somewhere in the forum a while back a member recalled how disapointed he was when they delievered his new 64 after trading in his 62 or 63.
,,,dq