That video was the gathering of Testarossas at Pebble Beach in 2014. They are all genuine, although some of them have been rebodied over the years after their original bodies were damaged beyond repair. See:
https://www.autoblog.com/2014/08/18/...monterey-2014/
By the way, your Testarossa won’t be the only one moving under Ford power. See:
https://www.ferrarichat.com/forum/th...post-142237510