Thanks for sharing this video JIM!!!!
It does appear to be taken around May 1964 before Shelby was involved in the GT40 program.
After watching again, @ 6:15 it appears the chassis has damage to the LH fuel sponson (rocker), and roof appears deformed upward, possibly GT/102 that crashed at Le Mans trials April 1964.
then @ 6:52 they are working on 3 chassis @ FAV, GT/102, GT/103, GT/104 that were sent to Le Mans
@7:07 the rear body now has ducktail spoiler that showed up at Nürburgring, one car has a center "rally stripe across the roof, GT/102 for P. Hill / Nürburgring ??
@7:40 the car has the Nürburgring / Le Mans revised nose/inlet/lights, then follows sequences from Nürburgring.
@ 9:30 it's moved to cars #10, #11 & #12 which are the door numbers worn at Le Mans.
that's my analysis
jim p