OK, you mean you bought it then, not that it was built then. My working theory now is that only 13 inchers were available early in the production year, with 14's available later - initially as standard in the Formula S package, which was announced in November of 64, and then optionally in non-S cars - when??
BTW, here's what the Barracuda's front valence looks like when the inset portion is NOT blacked out:
View attachment 1715845122