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Nice score. Most folks say that you need to change the brake line brackets. On your previous post I saw where someone posted saying that wasn't necessary. I don't know which is right, but I did change them when I swapped mine.
If you still have access you might want to grab them just in case.
Before I did that I'd soak it for a few days in a 50/50 mix of acetone and ATF and see if it'll break loose.
It may take a few days of soak, heat, soak, bang on it, repeat... If that still doesn't work then heat the crap out of it.