Under the wiper area is a cowl tag usually painted all black on a GN.
Read the upper code off of it left hand side.
Should be something like H01A, G12C, etc.
What is yours? That should tell you the build date approx.
Sounds like yours is the 30,209th REGAL produced, not all were turbos or GN's.
I doubt yours is a clone. Sounds like a winter '86 car.