The Brand X Eliminator car still exists, but unfortunately the VIN tag is long gone. For some reason, I think Grotheer's car started life as a Slant 6. I know his '67 car did.
Really cool project! I've been doing the same thing for '66 Coronet Base Sedan Hemi cars, and also the '67 R0/W0 cars. I currently have about half of each VIN documented.
