Paper Moon?
So is this similar to Paper Moon or The Flim Flam Man?
Paper Moon: http://www.imdb.com/title/tt0070510/
Flim Flam Man: http://www.imdb.com/title/tt0061678/
Haven't actually seen the Flim Flam Man for ages, must see if it's on Amazon Prime or Netflix. I was a huge Michael Sarrazin fan back in the day.