Shelby vs Ford Performance?

I have a coworker who just bought a 2016 Shelby GT350. I said, Ford made a good car, with the 350. He got defensive, saying his car was a Shelby. Not a Ford. It says Shelby, so it was built by them. I told him that the 350/350R was built by Ford Performance. Not Shelby. So, how can you tell if your car was completed by Shelby American, or Ford Performance?

It's a Ford, it was built at the Flat Rock plant like every other Mustang. The 5.2L Voodoo engine was built at the Romeo plant on the niche line. The car was not built or even touched by Shelby. Shelby does still make their own Mustangs (they take stock Mustangs from Ford and modify them like they did in the old days) as you can see here http://www.shelbyamerican.com/?topic=vehicles. But the GT-350 is a Ford product.

HI as this shelby cobra was the first car that kim selby dis some tuning on back in the early 1960's for racing. He used a classic AC cobra so. It was not a Ford.
it had a Ford V8 engine which Kim shelby worked on. So after his death some years ago the tuning was taken over by Ford themsleves. So it is very doubtful that any where left that Kim shelby worked on, his son has carried on with tuning some mostly only for the racing professionals.