I made some progress with the floors and the tunnel.
The original tunnel in this car was hacked to pieces along with the original torsion bar cross member due to an A body transmission install in a B Body.
Moving the rear floors forward the 19" dimension makes them much higher at the front of the rear section than they were from the factory.
I added metal at the sides of the new tunnel then added square nuts welded under the floors to make the tunnel removable.
Passenger side is finished including the transition to the tunnel.
Drivers side will be next along with some firewall repairs from previous A body pedal installation.
I need to tie in the firewall and floor repairs at the same time to integrate the new bracket from the frame for the clutch equalizer bar with provisions from it to install a support for the universal on the steering column base for the relocated steering box.