Not knowing much about Fords, let alone old fords, I understand that the Build plates are sometimes put in numerous different locations..... under the dash, on the firewall at the cowl area, glove box area and on the frame or all of the above... without the frame you might be looking to title it as an assembled vehicle unless you have a title....which I assume you don't.... Not sure how your state operates but in Mich we title these as assembled vehicles..... the state gives us a vin tag to adhere to the vehicle...
Sorry I couldn't help more.... but this is not my field of expertise.....[S