While it's got a few issues, which is not surprising, the car looks pretty darn good for the money. In fact, I'm surprised he's asking only $3,500. He could probably put a $5,000 price on it and get close to that.
I am curious if it actually has a 5 speed transmission or if that is a typo. Looks like the front fenders are rusted out at the bottom. Could need some rust repair underneath.
Hard to say if the 5-speed is a typo. It does look to have a later Model Pontiac V-8 installed, a 326 would be the largest stock engine in it. The Alternator bracket is a 1973 or later part. Cant tell from the bad pictures if it has a manual or automatic trans. All I can tell is the front bumper and Header panel is tweaked, some rust as stated on the front fenders and rear side windows. No mention of the interior condition or floor board condition. Also the rear frame rails tend to rust on the 64-67 A-body wagons. So the $3500 is reasonable.