On the 67 Birds - all of them were built at the same 1 plant - only Lordstown (U) .
6 cylinders and V8's
The 6's would have had their own 001 VIN car too , like has already been said.

In 68 Van Nuys (L) began doing Birds too.
I don't know enough about Camaros to know if Lordstown was exclusive on Camaro in 67 as well.

In case anyone wonders - part of why that 6 cylinder 001 Camaro had a body number of 200+ range is
the Fisher body build numbers didn't have any basis related to the engine like VIN did.
They just ran consecutive body numbers right through them all.
So that plant did roughly 200 +/- V8's before they did a 6.

Thanks to you guys for the information about the1967 001 6cyl Camaro. ; )
That would have been a wild wild pair to have had an 001 Bird and Camaro together !

In 68 there would have been potential for at least 3 , or 4 , different 001 Birds and Camaros.