Whats it Worth? 1965 Biscayne 396

[Bahnz70]

I just ran across a local guy who has a 1965 Biscayne 2 door with a 396 - he claims is original but hard to tell as I was not in the position to read the pad. It is not the original color but is painted a nice light blue - it is 99% rust free - underneath real solid - interior needs redone and engine bay and trunk need detailed. I have always been a fan of the stripped down post cars and this one seems affordable. He is asking 9k - just wondering in case it is an original 6cyl I won't be making a stupid purchase. Can we tell by vins on these or anything - I do not know much about the 65 identification.
Thanks for the help!