Have him sign the title. Don't fill out anything else. Pay cash for it. DON'T register it in the state or you will have to pay his fines. Keep it on private property. Sell it and the title to a junk yard when you are done.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge