Finding old movie featuring either GTO or 365

I recall seeing a movie when i was younger, i have no idea of the storyline but i recall that in the show, someone found a junker chassis, and rebuilt it as a replica of some famous racing GTO or 365, then attempted to pass it off as the real deal. I remember shots of them working on the car, building it up, and also when they were trying to sell it off, there were a few suspicious looks from potential buyers, and IF i recall properly, one raised an issue with the wrong spark leads or something.

This was maybe in the late 1990's. I was a young'un then so my memory is bad.

anyone can shed some light?