This is outside of my limited area of experiences - so please excuse my ignorance/boldness in asking the following questions, and, please excuse my ignorance in offering some suggestions. If the questions/information posted below are incorrect and/or are totally "off base", I will delete this post.
Will you have a 1958-1964 10 bolt rear end?
If yes, do you want to convert it to a 3.55 Ring & Pinion gear set?
If yes, might the items in the next two links be helpful?
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3.55 R & P set-
3.55 R & P installation parts-set