83 GT vin discrepancy?

[Shadylane]

My Grandson just purchased an 83 GT project car that is complete (non running) but appears, with my un-trained eye, to be fairly original, carb looks to be replaced.
It is equipped with a 5.0 four bbl and 5 speed. Here is the issue. The vin says it’s a 2.3 turbo car, W code, built in 8-83. Very late production if I remember correctly. I’m sure it’s possible that the engine could have been replaced but there is no indication that it was turbo equipped.
Thought about a Marti report but before I do I wanted see what you folks had to say.
Thanks, Kelly Lane