MikeA is correct, have your story straight before you approach the owner. I have done this many times, and have learned that it's best to be honest - the owners are a lot smarter than you wish they were! If you found him via a title search, tell him that, if he asks why, tell him why. It doesn't hurt to call first, might save yourself a 4hour round trip!
Send me a PM with some info, and I will let you know anything I have on the car that you are chasing.
PS: I will throw my Congrats in here to the new owner of the Deuce that MikeA was referring to, way to go Tommy - patience paid off