If the parts have recently been removed then the buyer is a thief now. If they were removed long ago then he was aware long ago that the vehicle was stolen and is guilty of involvement with the original theft.
If they were recently removed, you should be able to look through any threaded nuts on the car (rear leaf spring perches etc) and see if threads are shiny or rusty. If they are shiny, then the bastard stripped it because he felt the heat coming on and took as much of it as he could.
I say we all get a calling circle going and cluster f*ck him with calls 24 x 7.... Make him change his phone numbers for his cell and his business, keep him awake at night, harrass his secretary at work that answers the phone for him until he has to change all of his phone numbers..
Give him a pair of Chicago boots.... :finga:
Also we all should look on our local craig's list and see if any 440 block, 440 six pack engines, parts, Dana axle, etc are advertised and if you happen to be able to go look at them, see if they are from the stolen car and turn them in.