The fact that it's a hardtop means it was made in the latter part of the model year, since the Road Runner was originally only available as a pillared coupe with a bench seat.
The 440 badges on the hood, if they're not lying, mean that someone's upgraded things in the engine bay from the original Road Runner 383 V8, since the '68 was only available with a 383 4bbl or a 426 Hemi. (The standard Road Runner 383 was a 335bhp version, with a hotter cam and other tweaks exclusive to the model, unless you ordered A/C, in which case you got the same Super Commando 330bhp 383 4bbl as in Uncle Lester's Fury.)
