Is that goo, the seam sealer? If so assorted sizes of putty knifes, flat blade screw drivers and time is what it takes.
After blowing through a few of these spot weld cutters (see pic below), I re-evaluated what I was going to do. Middle sections of the floor, floor supports and passenger rear were still in good shape. I decided instead of replacing the whole floor boards, I would cut up the new ones and make patch panels and only fix what was necessary.
I did similar to elkenova and laid the pieces in and used a sharpie marker. Then took the pieces out and drew another line 1/8" lower, this was my cut out line. I cut around the seat belt mounts and left them in. I used a 1/4" die grinder with a cut off wheel. Then used an air chisel to cut through the welds along the rocker panels. Remember it's easier to go back and trim or grind a little more metal out than to fix that spot were you took a little too much out.
They don't make toe boards for a Nova. The one ones for a 67-69 Camaro work and are sold by some places as 3rd Gen Nova toe boards. The passenger side is an exact replacement for the Nova. The drivers side is a slightly different stamping around the headlight dimmer switch, it's still the same size as the Nova and fits well. Unless you place them side by side most people would not know the difference.
Paul
