Have you sent out any inquiries to Holman Moody and also to Alan Mann? Both company's siblings are still around and have access to original documents. The Henry Ford Museum has a slightly disorganized library with factory documents on file for research also in regards to Fords part in the development or mule cars also and the Arning mods.
There also seems to be a connection to the 1963.5 Rally Falcons in there for development which would also include DST (Dearborn Steel Tubing).
I don't seem to remember Chuck mentioning anything about the TDF mustang being around in early development of the GT350. Is there an approximate period when Shelby American did have their hands on an example of a TDF Mustang? I know that the winning TDF Mustang was sent back to the USA for a PR tour and a few magazine tests (one with the Comstock Racing Mustang) then back to Holman Moody for Nassau Bahamas 1964 and Daytona 1965 then back to Europe and eventually succumbed to a racing accident.
There also seems to be a connection to the 1963.5 Rally Falcons in there for development which would also include DST (Dearborn Steel Tubing).
I don't seem to remember Chuck mentioning anything about the TDF mustang being around in early development of the GT350. Is there an approximate period when Shelby American did have their hands on an example of a TDF Mustang? I know that the winning TDF Mustang was sent back to the USA for a PR tour and a few magazine tests (one with the Comstock Racing Mustang) then back to Holman Moody for Nassau Bahamas 1964 and Daytona 1965 then back to Europe and eventually succumbed to a racing accident.