Gus, just went thru this on my 69. I will tell you there is a lot of welding to be done for the verts. My floor did not come with the braces for the rear seat to floor area so I bought and welded in. Also I was not happy with the floor to firewall braces. They are not as thick as the originals.
Not too bad of a job but it took for ever and there is ton's of welding as you may know. Lots of messaging panels also.
Lastly there is a floor dip in the firewall seam on drivers side. My new floor pan did not match the contour so i had to cut this piece and dolly it down to fit the contour of the firewall seam area where it mated - then reweld it. What a pain that was. Mark
