Finally done! I finished up the front lines today. They still weren't easy, but I was able to crank the fitting loose so I didn't have to cut anything. I'm not sure why the rear lines were corroded so much worse than the front, but they came loose after a couple hits of pb blaster. Now I have extended SS brake lines, a full 3qt fluid flush done, and braking feels great!

 

Glad to hear it is all finally done.
Good job.
Thank you for posting back.