Care of original paint (mid 60's Laquer)

[Day2_69Z]

Wow, you're asking time to stand still.....
And as a famous singer's lyrics spoke volumes. ...
Rust never sleeps.....

Not that I've done this recently....
(I have, decades ago on barn finds)
A RA IV Judge, 57 Chevy, 70 Monte SS 454 & 65 Malibu L79 , all with Lacquer & 2 out 4 in Black , I mixed Clear playing with Hot to Cold thinners finding a match to other body panels ,matched the sheen/gloss then lightly sanding orange peel to a moderate level and buffing with very minimal contrasts.
Test it on other old or original paint, you may be quite pleased.
Good luck