Interesting, I didn't know they were single stage. I didn't know GM did anything in the 80's and up without clearcoat. That makes me feel a bit better about the amount of paint transfer to the pads.
They definitely get rougher as you get to the bottom of the doors and such. My in-law has owned it since new, so it's not had body work or anything. But it definitely gets rough near the bottom.
Much on the car is original. I think it probably needs a bit of a tune-up. To me, it idled and moved at low-throttle a bit roughly, sorta like a carb'd car. I was also surprised by how large it is. It's about as long as the Aurora, I could barely fit it in the garage. And it has the digital dash option, which means it only has a speed and fuel level display.
To me it felt very much like the "old" GM cars I'm used to (mostly 70's Caprices and 80's Celebrities). I'm not sure I'd feel comfortable doing 100+ in something like that. The Corvettes I've had from the same era feel much more like a "modern" car (except for the crappy
headlights and windshield wipers).
Still, it's quite a cool car.