I understand the apprehension towards having the motor pulled to do the work, but let me put your mind at ease a little. I was a GM tech for about 10 years before getting on the FD I am currently on. If the tech pulls the motor, he will have all the room he wants/needs to do the job right. If there is minimal room to work as would be the case in the cylinder head, you are more likely to have seals, gaskets, etc. not be placed or sealed correctly and have to go through it all over again. Don't be afraid of the thing being pulled out.
I'm sure someone will have a different opinion or experience on this, just my .02c