1980 GMC Crew Cab Question. 81 Cab?

[splehigh]

Hello everyone,
I recently bought a 1980 Crew cab 2500. According to the VIN it is an 80 crew cab 2500 but it has the newer 81-87 style cab and front clip. The slots in the cab for the hood hinges appear to be there from the factory. It also has the newer style 81-87 style dash.

So at this point I'm trying to figure out if someone swapped the vin tag or if its possible that it was a late production 80 that got the newer cab. I don't think that is possible but one could hope. Perhaps Keith Seymore could answer that.

The VIN is TCM24AB******

Any help is greatly appreciated. Thanks