When I remove the old vinyl roof, do I have to remove the headliner too? (73 Imperial)

My vinyl roof is now 48 years old and shrinked in the infamous areas behind the rear window - and therefore is a little bit torn there.

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When I want to completely remove the old vinyl roof, does this affect the windshield or the headliner?
Can the windshield stay in place or should i remove it for installation of the new vinyl roof (when it will be delivered someday)?

I´m thinking of redoing that to, after 48 years - but maybe there are things I don´t want to see underneath...

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Author: Joerg