For a car that came with black interior, someone went to a lot of work to make a complete changeover to red.
Wondering of the salvage title isn't from being stolen and recovered, sans the 390/4 speed...
And this pic is, in all likelihood, the tip of the pile of rusted panels that needs to be replaced. The floor pan has been replaced already in the distant past. The frame rail extension should have a flange that welds in the step of the pan, right above it, but is rusted off.