this has been discussed at great length here but bears doing again.
The way I remember it there is a PVC that is approved for air. The Stuff you are looking at in the big box lumberyard isn't it.
The 370 number you see on the pipe you looked at is the burst pressure, not the working pressure. Over time with fluctuations in pressure will weaken it and it will burst.
You are not talking much money so go with the black iron. I have heard that Galvinized can cause issues with air tool motors as it ages and the galvinizing starts to come off.
Also make sure you put in water traps at every major bend in the pipe.
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