There is a huge amount of info at that link. You can spend hours there.
Basically, cars were NOT built in VIN sequence. All cars were given an SPD(scheduled production date) That was the day the factory "hoped" to build the car. That didn't happen most of the time. Cars were built before and after the SPD. Sometimes weeks before or after.
There wasn't a Challenger line and a separate Cuda line. They were all built together.