Hmmmmm. Well, who ever wrote the letter, is either ten years old, or can't spell and needs to go back to school. They also appear to have very little knowledge about turbo's or cosworths, otherwise he would clearly know that in your first pictures, the turbo is definately a T34, the wastegate is also clearly a totally standard internal item, as you can see the arm from the actuator is connected to the internal wastegate. Oh..........and I can't believe the breather system.....Total Joke.

The breather system is not connected properly and is missing both a return hose and a drain/waste hose at the bottom. Run the car like this, and it will soon fill the engine bay with oil, as it'll vent directly into the engine bay..................LOL. This looks a very bodged engine (Just going from the picture). I'd be very suspicious about the engines quoted bhp, as with that turbo, your going to be lucky to see 370bhp. As the engine is in that picture, I'd bet a months salary its not more than 370, and if I opened it up, I'd also bet it's got standard internals.

Either someone has taken you for a mug, or this is a joke.

Sorry to be so blunt, but that's the way it is.