Volvonaut- Yeah, I too would definitely prefer to have that car in single stage as opposed to b/c. I'd go to pretty extreme lengths to avoid having to repaint that in b/c. I'd have my painter searching for matching old-stock single stage, just in case it needs some paint/body work.
And I'd lean towards the Meguiar's approach too, though I'd probably use something more user-friendly than the #7 (either #5 or #3). I never did like #83, so I'd use something else for the aggressive work (if it's necessary and the paint can withstand it). But yeah, #80 oughta give the right look.
If the paint is *REALLY* thin and/or fragile, I might even just do it with #9! Perfect correction wouldn't be a priority for me on that car.
I'd also consider using Collinite wax on it instead of the #16, much as I do like, and use, the latter. That's *consider using*, I'd have to think about it and make up my mind when doing it. The only one of your waxes I've used is Trade Secret, and I'd want something longer lasting and better protecting than that.
But no, I wouldn't use a sealant on it. And I wouldn't try to get the paint 100% perfect or even all *that* glossy. IMO it'd be the wrong look for that car; I'd prefer the way #80 finishes out over, say....something like Menzerna or even M205. I'd be aiming for a "period-correct" look on that car. Just *IMO*, but it shouldn't look as high-gloss reflective as, say, a brand new Lexus. It's a '65 Volvo, and that's simply different.