65 casting date blocks could have been used in any 65-68 Hemi car, Race or Street Hemi. The cross ram would have obviously been correct for a Race Hemi if originally installed, etc. The VIN would not appear on any Hemi until 1968. You'd usually find the 68 model year VIN stamping on the upper rear of the block just opposite the oil sender. If it's a Race Hemi it would have also had unique stampings on the upper distributor ID pad. If it turns out to be a 65 casting date Race Hemi with a VIN# it's most likely a 68 Super Stock Dart or Barracuda engine. As mentioned, post all the pics you can of any numbers you find and it shouldn't be to tough to nail it down to one or the other.