Since you’re interested in memorizing texts verbatim, I think you may like to read the following post by one of the legendary users of the forum:
There’s also a thread on memorizing the new testament that you may find useful:
Memorizing texts verbatim using a memory palace is really hard, so I’d probably mix it with lots of repetition. Something like John Place’s method (you can find it on google) would be better as the main technique.