What makes you think that the car originally had A/C?
If the car for sure had A/C then it could not have been a COPO.
If there is no engine in the car... click a few photo's of the firewall (Left side, Middle, right side), motor mount stands, clutch bell crank (if 4spd), and the trans crossmember.
Assuming that it was not originally an A/C Car...
Was the car an Auto or a 4spd?
If 4 spd check for the Muncie speedo cable location.
Also check for the cowl induction firewall piercing... I believe it is 7/8" just above and to the left (if standing in the engine compartment looking towards the interior of the car) of the main harness bulkhead connection on the firewall.