High idle after replacing distributor assembly

I have one question. My 73 year old eyes have difficulty seeing past all the hardware that appears to be blocking my view of the Idle air control valve. The instructions you provided say disconnect the electrical connector and remove 2 screws. Is that's it? Removing the valve is that simple? So I don't have to remove throttle linkage cables or anything else?

Thank you very much for all of your help and guidance. I'd be lost without this site.

I removed the IAC Valve. Image attached. Dropping the throttle linkage was simply two bolts and necessary. The distance from tip of pintle to mounting flange is 35mm. Your instructions note for a new IAC it should be set to 28mm. The cone is pretty rusted. I've seen warnings about using cleaning with solvents. Question: What do I clean with? Gasoline? Note that is rust on the pintle cap; also, the pintle doesn't move in or rotate; although I only very softly tried to push it in or rotate it.
I'm leaning toward ordering a new one.
One final note: I never described what I had done before the issue started. I replaced all the plugs and the entire distributer assembly (old one was rusted inside); I timed the engine as instructed in the automotive manual.

Well I got impatient and cleaned it with injector cleaner spray. Used steel wool to polish the IAC tip. Got everything back together. It started up perfectly and runs smooth for the first 3-4 minutes. Idle is a bit lower RPM then the high RPM I had. I don't have a tachometer of course.
Now I have a Check Engine Light. The code I get using the flashing dashboard lights is code is '23' for the intake hot air flow sensor circuit. Whatever that is. Probably got the code by following the instructions to disconnect the battery for 10 seconds, then turn on the key for 10 seconds and then off; something like that. The code may clear itself. I cleaned the valve with spray injector cleaner. The new part will be here in a few days. I'm going to drive it around the block and see how it runs and I'll let you know. The one other thing I did when I installed the distributer was clean the EGR valve. Maybe that is a contributing factor. The EGR can really mess up how the truck runs if any carbon gets trapped in the valve. The 95 Astro is a mechanical wonder. How it ran so good for 110,000 miles is even a greater wonder; but it's the only truck that I can put my 12 foot kayak into and close the back door so it still has value. Thanks for the guidance. You and the other pros are very generous and helpful. Stay Safe.

PS: The truck is running better. The Idle seems to be adapting and the Check Engine Light went out. Perhaps I got lucky. Time will tell.