I cleaned off an authorized modification label on the fan shroud with some paint thinner. It had a date of 1/20/1988 and a dealer # of 07852. I found a list of dealer codes at
http://gtcsregistry.com/dealercodes.htm. The dealership it had the work done at was Fairview Ford in San Bernardino, Ca. It is about 6 miles from the San Bernardino CHP office. I know it is not a confirmation, but it narrows it down. I pass this along so guys with mystery cars may be able to track down some info.