71chevelle - Welcome to Autopia! IF your car has the original paint, then it's not clearcoated. That's a pretty big *IF* after 30-some years. If it's been repainted, it may or may not have a clearcoat- depends on what they repainted it with. If NO clearcoat, no problem, just don't keep polishing until you hit primer. I actually PREFER working on single-stage paints.
If you get color transfer to your pads when polishing, then you do NOT have clearcoat.
The MCRC is PROBABLY more aggressive than you'll need. It's good to have it on hand, but try the DACP first. REALLY work the DACP until it's about gone, the abrasives need to break down.
You might still need something after the DACP before the
AIO, some do, some don't.
If you don't want to redo it for a while, I'd go with a synthetic sealant.
I myself would put a coat of BFII or PUPP or EX on before (or instead of) the S100. I MIGHT also consider VM instead of the AIO. I'm thinking about the exact look you're after, which will vary depending on which products you use. BTW, I just LOVE those dark greens! So I'd maybe try to pick something that would really make the color look special. I somehow think there is a better combo for that color than AIO/S100, NOT that that would look bad. Yeah, if it were MINE, I think I'd go VM/PUPP.