but about the bolt, unless you can get a very straight shot at it, I would not attempt to drill that in place. Pulling the motor isn't that bad, though I do believe you've got some extra plumbing off the oil pump that needs to get unhooked. With a good high lift jack you can get the motor out solo in under an hour. I had a weenie little jack that required a bunch of iterations of blocking the car, blocking the jack, blocking the car again, etc until I could get enough space underneath to drop the motor. The motor came out and in the same way. Dealing with the blocks and the jack took longer than the entire rest of the process.
Yeah you're right-- after mulling it over, there is other stuff I've been meaning to do for awhile now anyway like clean up the engine, replace the tarboard in the engine bay, etc... so I just decided to go ahead and pull the engine today:
What the autostick engine bay looks like without the engine (note the torque converter resting in the bell housing):
It sure will make it WAAAAAAYYYY easier to get that bolt out of the flex plate too: