OneStopRestoration's Special Orange 69 Chevelle 300 Deluxe Coupe

[OneStopRestoration]

I was curious if anyone could provide some explination about a few things related to the 300 deluxe cars. Upon getting into the car I noticed that there were small twisted shank nails pounded into the floor board area of the car in various spots below say the kick panels, along where the sill plates go, and even along the back edge of the interior where the floor carpet/matt would have ended just under where the seat frame attaches.

The nails look very factory to me, so im curious as to was this a way to hold down some sub insulation? Where these nails used to actually tack down the rubber floor, or is this just a case of something odd happened to the car during its life? Pictures showing some areas where I found them.

[OneStopRestoration]

Seems like just about every car I restore someone has butchered the speaker holes. Pretty easy fix. Always nice using original metal as it fits into place with no massaging or mismatching of holes and profiles.