Agree with the vinyl top not being factory. The thickness of the material, as evidenced by the way it tucks around the rear window molding, is not what was used back then. Definitely aftermarket, as the "Brougham" nameplate also seems to be. There were some "trim shop" vinyl roof packages of this nature, a while back. Like the non-factory cloth overlays of later times.
I did driver training in an Ambassador similar to that. Not as highly-optioned. It was a nice, smooth, decent car. Not very exciting to drive, but a good driver.
Would make somebody a good car for many more years, but not for $10K, to me. But then look at what $10K, even $12,995 will buy on the used car lot today!
Update the rubber hoses to ethanol-friendly ones. Make sure the tires are recent! Update the a/c to R-134a. And you're done for years, I suspect. Unless you want an updated radio . . .
CBODY67