Need gas pedal assembly and other misc items for 1971 Plymouth duster 340

In your 2nd pic, that is an air door that should open up. BUT BE CAREFUL. The hinges could be rusty/seized and you risk breaking the plastic. The hole in metal panel(door) Should have a knob on it. See pic


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I guess someone already broke where it connects, see pic 1 can I drill and put a screw in the middle hole on the hinge and connect it that way? What opens and closes the door using the handle?

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