I don't want to get hung up in the coming storm but that engine compartment does look pretty bad for only 1100 miles of use and then storage in a climate controlled area.
All that probably means was that it was stored in a heated garage. The humidity fluctuations in Illinois would still have an effect on the car. Also, the engine paint and other finishes applied by the factory back then weren't up to the level of the typical "over restored" cars of today.
