Ryan is correct, it should turn 90 degrees and go through the firewall. Do you have a side version of the top photo (it may be there, just not shown well)? I'd take a removed photo of the one from my '76, but I just modified it for a vortec swap.
Here's a few photos of my CA '78 pedal. The California trucks (and maybe later Federal) had the paddle on top to actuate a smog switch. You can see in the second photo how the arm turns forward towards the engine compartment to mate up with the mechanical linkage.