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I spent the rest of the day removing some parts that connect the body to the frame or pieces mounted to the frame.

There is a small plastic tube that runs from the engine bay back into the interior under the dash and up under the cowl. To be honest, I'm not even sure of the purpose of this tube unless it is for drainage or for windshield-washer fluid (though if so that is not original and there is no fluid reservoir or anything else to indicate such a system). Anyway, I pulled it out and will replace it if I find out it is a necessary piece. Here are a couple of pictures of the run of this tube, from the engine bay through the firewall under the dash. The tube then runs up through the body into the cowl area and splits off in two directions, terminating at silver pieces mounted on the body. This is a shot of the y-shaped tube removed altogether. After having removed all of the wires from the dash harness and the cables from the interior, the last remaining piece that communicated through the firewall was a metal line that (I believe) operates the oil pressure gauge on the dash. This metal line feeds through the firewall and around with the brake lines down to a soft line into the engine block. I disconnected the hard line from the soft line to break that connection.

Here is the hard line inside the car and then on the other end where I traced its path down to beside the engine block. I disconnected the soft line by turning the coupling on the hard line using a 1/2" wrench and holding the coupling on the soft line steady using a 9/16" wrench. I then unbolted the soft line's coupling and removed the soft line from the bracket that is mounted to the body and popped the soft line off that bracket. I reconnected the coupling to the soft line.