I think the giveaway is the door chrome and tail panel chrome. No one sticks those on Barracudas. You have them or you dont. Even the cars with the A51 option don't get these, Only real 'CUDAs.
Also the Rear valance, door panels, blackout tail panel, hood and I even like the color. Lots of JA5 (silver frost metallic) cars built in '73
The weird thing is you always see Barracudas listed as 'CUDAs but never the other way around.
IF that car had a VIN starting with BH it's more then likely a rebody. Funny he doesn't list the VIN