No help really but just an opinion. If it is a driver as mine is even though it is a numbers matching 82CE it is my my main driver when running. I have a 4 runner when it is not running.
GM paint jobs have always been bad when compared to other unmentionable American car companies. Almost anyone above Earl Scheib will give you a better paint job than factory. Note I said better paint job not better paint. Today's paints leave a lot to be desired at least here in California. Even good old Earl if you do not choose the bottom level paint job will be better than GM provided off the factory floor.
I know someone will disagree of course so just consider this my opinion.
Now that the lead in is done. I would look for someone that has painted fiberglass. As soon as they told me I needed to spend at least $4000 dollars I would walk away. In San Diego you can get great driver paint jobs looks perfect at 5 yards starting around $2500 with very minor repairs. I have seen a 82CE with the fader painted on for $3000. No orange peel. I need a little more repairs so I'm expecting to add about $1000 to that.
Check with a local hot rod club. Check with more than one guy. This includes my opinion. I have seen some $8000 and up paint jobs that will blow you away but I sure would not park it in a parking lot.