First off, what year of Ford? If you are looking for info on a 55-57 other than a Thunderbird, good luck. It was my understanding when Lois Eminger/T-Bird club received the Gate Releases in the early 60's, they received both T-Bird and passenger cars for all assembly plants. The Gate Releases were sorted to archive the T-Bird builds. In addition, Gate Releases for the 1957 E and F engine passenger cars, along with certain cars sold to high profile individuals were also kept.
1967 and later Ford were computerized, and are available through Kevin Marti.
1966 and earlier, other than Special Vehicles Dept. and certain factory race cars, are most likely gone, at least at Ford. There may be a possibility that State motor vehicles can run a search. I believe one of the issues today, are that of privacy. 20+ years ago, I ran title searches on cars in various states, including VA, and did not have any issues
I believe the fire referred to was the Ford Rotunda in Dearborn that burned down in Nov 1962. In reality, the majority of records were/are kept at the old Highland Park Plant.
If you do come across a resource, kindly let us know.
Thanks.
Regards,
Dennis