Given what you have, Marti Auto Works (http://www.martiauto.com) can probably search through the records they licensed from Ford to help you figure out what the rest of the VIN might be. If all you have is the stamping on the aprons, with no dash plate, door sticker, or paperwork, the only other place a partial VIN might show up is on the engine and transmission if they happen to be original. A call to Marti Auto Works (they may charge a small amount for the research) might be the quickest way to figure things out.
Scott Hollenbeck
1970 R-code Mach 1
http://www.428cobrajet.org
Fairfax Station, Virginia, USA
Scott Hollenbeck
1970 R-code Mach 1
http://www.428cobrajet.org
Fairfax Station, Virginia, USA