63 Falcon Deluxe Ranchero

just bought this, didn't know it was a "deluxe" or that it has a 260 instead of a 289 at the time I bought it. does anyone out there know anything about these? what makes it a "deluxe"? and with only 6,315 produced, how much of a rarity is it? I was going to drop my 289 in it, but I am now at a standstill til I know what it is I really have.

thanks all!