Charles,
What are you thinking?? On 67-68s it is far easier to install the firewall pad before the wiring harness! Also the wiring harness needs to be on the outside (tar side) of the firewall pad for mounting the fuse box.
Sparky,
I recommend installing the brake pedal assembly first, then the firewall pad, then the steering column & steering column clamp. The two seals around the steering column go on first and then you have to pass the column through the seals. the 2-piece clamp at the firewall goes on last.
Regards,
Pete Morgan