70 a body heater box 73 duster

Princess Valiant said
Totally different firewall bolt patterns,

Are you sure?
Cuz I think I have a non-A/C 73 Dart box in my non-A/C 68 Barracuda. I think but not quite sure........ If someone would have asked me this yesterday... I wouldda said yes.
Now; I don't know.......