Just because the head comes off doesn’t mean the entire engine has to be rebuilt. I had my cylinder head off 3 times in 30 years. Left the block alone.
If you don’t plan on using the rear window wiper, (I never did) removing the wiper motor removes a ton of weight in the hatch. That motor...
My air nozzles looked like that too. A likely reason everything is so rusty up there is because there’s a good chance that one of the freeze plugs on the top of the head is weeping — keeping it wet up there which creates rust.
I got all my rusted nozzles off successfully using the following...