Before I removed the running gear I begin designing a firewall.
The supercharger lays inside the car about 4 inches.
Rather than modifying my current firewall I decided to start from scratch without interfering with the steering column and pedal components. I wanted to create a uniform hole in the firewall so both sides match. In reality the opening in the firewall could be half that size. I also removed the the wiper motor opening and will mount the wiper motor on the inside. I also bought a 10x10 heater box from vintage air to give me more room under the dash.