Car looks rough as it sits there. My guess is it doesn't run or he would say that it does. The interior does nothing for me, either. I think $3500 is a pretty strong asking price if it doesn't run. Similar-year wagons in better condition can be had for the same money. http://www.stationwagonforums.com/forums/showthread.php?t=34627 Good luck to him.
Wow, a '68 Bel-Air with tilt wheel! That had to be rarely ordered option on those. Didn't even see many Impala or Caprice that year with the optional tilt wheel. The A/C on this car is aftermarket.