This drive shaft was completely stuck! Apparently either corrosion or old dried up grease had welded the drive shaft splines into the engine. I went through t a few attempts and finally turned the engine upside down. That, and liberal amounts of "FreeAll" penetrating oil, really turned the trick and allowed me to get this lower unit off!
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https://extremediy.org/remove-outboard-lower-unit-stuck-drive-shaft/