Or was the car built by Dale Coynes?
I also found a Davey Hamilton, who, if the Hamilton bit is right, might be your man. He runs Meridian Speedway with his father (no name), and has a son who’s now competing in racing. (JD Hamilton)
Oh, also found something on <<< link removed >>>, about two thirds down. The car was called the Crop Duster and was apparently not successful. And they mention Davey, so I guess that's it then.