It looks like it has pod filters on it. Consensus is that the factory constant vacuum carbs run best with the stock airbox, but can be made to run by changing jets and making adjustments. Best way to check is with a test ride. If it seems to accelerate well and doesn't stumble, you're _probably_ OK. See if you can pull 1 or 2 spark plugs after the ride to check the insulator color. It should be a very light tan, if memory serves.
Other than that, cosmetically, it looks very nice and a good daily driver. I'd see if he could come down a little bit, but I'm just cheap that way.
I got mine 18 months ago for $500.
Welcome to the forum. I hope you enjoy it and come back soon.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.