[Powershift1038]

Most newer VINs are 17 digit like the one you posted. Was that stamped on a metal tag, and riveted to the frame cross bar? Or, was it stamped into the frame itself? I would assume a 17 digit one like that would be on a metal plate riveted to the frame. The SPF number, if it is indeed an SPF, would be stamped into the frame. I have seen some SPF cars with a 17 digit VIN tag riveted to the frame (assigned by CHP or DMV).. and the stamped SPF number nearby.

If the trunk hinges both have 303 on them.. it's possible it's an early SPF chasis. If you can post pics of the car here.. I'm sure it will help identify the brand.