J.T.,
  Take the stroked crate motor and have pre 66 identy numbers cast onto it. There are several pre 66 390 blocks around this area, but I am not sure just how good they are. As for being confused, I heard that confusion is the mark of Genius. If that is so, then according to the Kit Car article, our DMVs must have a lot of Einstiens (spelling), working for them. 
 
Ron  
   