Identification Information for Possible COPO

[KXW]

As per the VIN, I was just curious as to which V8 engine originally came in the car. Since there's really not much of its original equipment left on the car, I’m not able to determination if the car originally came with a small/big block. I will be taking some pictures of the firewall area and checking for some other clues as suggested sometime this weekend. The previous owner did not have any other documentation for the car. I’m keeping my fingers crossed that the firewall reveals the proper hole for the cowl induction option. I understand that this in itself is not proof of a COPO and without documentation almost impossible to prove. The current car’s status/description is as follows. The steering column is notched for a column shift but the car also has a clutch pedal. I'm assuming the car was originally an automatic because the steering column is red and matches the color code on the trim plate. All pedals look factory as well but the transmission tunnel appears to have been cut to allow adequate space for a 4 speed shifter. The car is painted primer gray but I will be checking the sub-layer color of the tail panel and the cross member as suggested. The car has a Ford 9” and it’s been tubbed. No tachometer on dash and the heater core and cover have been removed and replaced with sheet metal. All small components and wires that were located on the firewall area have been removed as well. Dash is complete other than that nothing is inside car except for a driver’s seat and role cage. Car is missing the power buster but does have front disk brakes. There are no engine-size emblems on the car except for a Z28 emblem on the rear panel. Except for the front disk brakes and trim tag information, there is not much to go on. If there is any thing else I can check for, please advise. I was hoping that someone perhaps might have a list of COPO body numbers or VINs from other smaller dealerships and could possibly confirm the VIN or body number as a COPO? I will provide an update sometime next week after I take pictures and check for other clues. Again, thanks for all the replies!