His name on his wife's tombstone is spelled "Ambrose." They are both buried in the Boaz family cemetery. This is a nice little cemetery just west of Owingsville, Kentucky. It is on 60W at the top of the hill just past See's Turnoff. It has an old stone wall and an iron gate. A log cabin is/used to be nearby. This was probably the Boaz home. (These notes come from the transcription of the cemetery.)
This is Charlie Wells' (cwells@indy.tds.net) great uncle. Charlie sent me the picture below of their tombstones.