It appears the exhaust is painted on both sides on the turn downs so as not to show behind the wheel in the wheel house...
Photos like this are invaluable to those of us trying to replicate assembly line authentic finishes and assemblies during our restorations.
The understanding JOHNZ has brought with the research report from sheet metal to drive off is irreplaceable to any restorer of first gens, this is why I was questioning JOHN as to the differences in the processes between the two plants. I also restore Pontiacs so any information as to how things arrived/were done within that division helps me as well.
Understanding assembly lines helps immensely when putting assemblies into cars, if done how the factory originally did it, the restorations go together correctly the first time, rather than assembling then disassembling in order to install an assembly which should have already been in place.