grill is 1979, lights on top are added on, picture doesn't show interior...no head rest??

Just look at the grill. That alone would tell you it's the wrong year.

You're kidding right?! This is, my guess, a clone. And a bad attempt at that. Wrong wheels, stack tips, wheel opening stripes, and more I would bet. Give me the trucks serial number and I'll prove it is a FAKE.