Hello Jaru,
Your interior looks great.
Personally, if I were you (I know, I am not), I would keep it.
Don't replace the complete interior. Only have the panel (the "bottom") replaced that is damaged but keep the remainder 95% of your factory-original interior.
You don't need to go with "all new" on a 48 years old car; it's original only once.
Just have the damaged section replaced.
A good shop can even match the color of the newly replaced section in order to make it look identical to the rest of your interior !
Good luck !
Achim