The Number on the inner fender is the ONLY official number for liscensing and registration. The door tag IS NOT valid for that purpose. The fore-mentioned as paraphrased from the Ford Shop Manual. Since the inner fender is an integral part of the framework of the car, you would need the documentation from that vehicle also. Maryland would probably consider it a reconstructed vehicle which requires the following for Proof of ownership – The ownership document must be for the vehicle frame used in building the reconstructed vehicle:
If the frame is new, the certificate of origin included with the kit is required.
If the frame is from a used vehicle, a title for the vehicle in your name or a title that has been properly assigned to you is required.
If the frame is from a salvaged vehicle, a salvage certificate in your name or a certificate that has been properly assigned to you is required.
Other documents that may establish ownership are:
Registration document and bill of sale – ONLY if the state from which the frame was obtained did not issue a title (usually because of the vehicle’s age).
Hope you get it straightened out!