It took 90 minutes, but I got the upper, passenger side bell hosing bolt out today. I broke it free using an open end from the top side, then went underneath and used about 4 extensions and a wobble to back it all the way out. Once it was loose, it took about 60 seconds to get it out.
I also removed the 15mm bolt holding the dipstick and AIR tube bracket from the back side of the passenger side head.
As it stands right now -- I think everything needed to take the motor out is now disconnected, so I need to go get a cherry picker and an engine stand.
Next weekend is Father's Day, so I probably won't do this for another week or so.