Welcome Paul,
As you pointed out, 30+ years is a long time for a piece of audio gear. Components do wear out and even if there aren't outright failures in those same components, normal degradation may adversely affect audio quality. But the good news is that almost all these pieces of Carver gear can be serviced & restored and brought to good-as-new or better-than-new condition. So in your particular case, it seems to me that the pluses are you can demo the unit and if it's all working, you can just drop it in your rack and start enjoying it. And if something dies down the road, you can ship it for repair. The downside is that if it dies in a relatively short period of time, you can end up with a total cost (initial + repair) way beyond the market value. But that's the risk for using any piece of unrestored vintage audio gear.
That price on the one you're looking at does seem to be full retail. For context, here's one in Canada on eBay for $299 C. They do come up for sale with some regularity if you feel like waiting. But if you're OK with the idea of some risk of using an unrestored vintage piece of audio gear, it's the model you want, it's in great condition, and the pickup logistics work for you, then it sounds like you should jump on it.
Good luck!