'65 A904 park lock cable housing

I had a '65 cable shifted V8 A904 rebuilt for my '65 Barracuda, but it was missing the park lock cable housing. So I was planning on using the one from the '65 cable shifted slant 6 A904 that was in the car. I had no issues getting the cable out per instructions from the FSM, but housing/ cover won't come out.

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I removed the 5 bolts on the housing, but it's still stuck on there. I've tapped it with a hammer, but I just don't want to break anything.Could it just be caked on to the transmission, because it hasn't been removed in decades? I have daily driven the car for 13 years and the transmission wasn't in great shape when I bought the car, so I'd say it hasn't been touched in 20 years at least. Any ideas?