Pulled up the carpet today...

[myyamr7]

I knew the truck was solid, but you can never tell looking under them with 40+ years of undercoating build up. I was surprised to see the floors in such good shape. I can't really tell if they've been replaced before or not, the only clue to me is the black seam sealer? Is that factory?
I'll have to start my build thread soon, I'm still taking the truck apart and hope to have the cab off this weekend..