If you want to try it, unplug any connectors associated with the AIR system and see if you throw any codes. If not, you can remove it.
Thats about the ONLY thing I'd mess with. Even then, it's begun to get a little iffy. I always thought AIR was injected only during cold engine operation, (and that is pretty much still believed) but according to some "research" I've seen lately, at least in some OBD1 vehicles, AIR is injected into the exhaust during cruise, more than likely for converter operation.
Along with this, the ECM changes the O2 sensor calculations based on the increased O2 content it will see when this happens. Obviously if that is the case on your truck, then you hurt performance. If you pull it and don't mess with the cat, you COULD hurt the cat too.
Now all of that is theoretical, because I haven't seen anything where anyone has done that kind of testing/code interpratation on the ttruck TBI systems. But to say it doesn't happen, isn't possible if the research hasn't been done.
I pulled evap off of my truck when I first built it, since the setup I had didn't support it. Now that I have injection, properly venting the tank is a big issue. How do you keep moisture out of the vent line, and how do you safely vent the tank? EVAP does this very well, and I shouldn't have removed it, for now I regret it.
All of that being said, I'm sure there are plenty of people that have done what you said, and had no discernable problems. Just making sure you understand that the possiblity exists.
If the truck is running good, leave it the hell alone.