Roadrunner or Not

hidden numbers were not the vin in 68 that didn't start until 69. They matched the SO number from the build sheet and fender tag. Without any of that documentation it cant be proven that it matches to anything. Only thing the hidden numbers will show is the SPD, Year, factory and the SO numbers. This is not the vin maybe a very late production might have a VIN but I doubt it. As stated only engines avail for RR in 68 were 383 and Hemi. The only way you could get a VIN would be a state issued one. As far as fender tag goes no one will touch it without documentation to support it.
I would, Like the Iron Maiden song - Run for the Hills.