Note mounting tabs. All Barracudas have the "rally dash" whereas it was optional on Darts. This is for '68 and '69 only. It would appear yours is a '68, '69 Dart w/ standard dash.
Not a big deal, but one lever operates two cables for selecting heater or defrost. The other lever selects just the amount of heat you want. Good luck.
"A" body radio's don't mix. Your radio is a Barracuda unit. It is identified by the left mounting tab being in the "up" position rather than pointing to the left. Good luck, looks nice.