Part 16 (and 15 for the clamp) on the parts diagram shown here
Dogmush, thank you very much! That is indeed exactly what I was looking for, I couldn't find a good diagram or even picture like that when I went looking. Internet is a bit more limited here for me than at home.
Dad just isn't as able with this stuff anymore. Replacing spark plug wires (two disintegrated in my hands), fuel filter, and doing an oil change. Getting a bluetooth ODB2 reader so I can check the engine stuff, he had somebody do it at work which is why he got the wires. And a distributor cap that is for a different vehicle. :/
Totally didn't know that the box is a resonator. Once I knew what it was called, all the searches fell into place. Googles air intake resonator - Oh, that's interesting. Increases power AND reduces noise. Interesting.
edit: And ordered.