Do we know what was assembled on the firewall before application off the sound deadener ?
Just to expand a little
First it wasn't sound deadener but in 65-67 it was an adhesive. Product was also used to "black out" the horn wires during some production periods likely at the same station and the firewall sealing.
Attached or installed before hand was the
- master cylinder
- brake lines and retaining hardware
- electrical pass-throughs and junctions
- heater
- heater hoses
- speedo cable
- choke cable
- steering column and seal
- throttle bell crank and seal
- clutch rod and seal
- short e brake cable and attaching hardware
What was not attached was the ground wire and attaching screw. The cable was attached to the engine and installed with it later.
This and examples of the application and areas typically covered are shown in that article I posted on undercarriage finishing