A friend and myself built a 65 Barracuda back in the late 90's and we ended up taking the floor from a valiant out in one piece cutting all the spot welds out.Damn ,there must have been a hundred of them .That was the only way we could do it and I think you are in the same boat today.No one makes stuff for these cars really other than these over priced patch panels for quarter panel replacement and these little floor pan sections .But if you and I had 67 and up it's all out there.