I checked the VIN number on the engine block and transmission, and both have matching numbers. Since the front clip is removed, getting a look at the VIN stamped in the cowl near the blower motor was easy. The numbers were upside down, but they were easy to read. However, they read 8U138444, and my VIN is 8U116567. The welds looked factory, and I believe the firewall had never been replaced.
Since the car was "originally" both green and blue, I am repainting the car blue since that is the color I have always known. More importantly, my wife hates the green and she said she might not want to go driving with me if the car is green.
Thank you to all who have offered opinions, advice and facts! They are all much appreciated.