Dart ID help

Going to be looking at a Dart. There is an outside chance that it may be a factory hemi Dart, or maybe a factory big block Dart. (I know, it's probably a slant six car, but you never know til you look.) I don't know what to look for on the car to see if it is any of the above. Can someone give me a few obvious things like VIN or fender tag callouts or something?:read2:
Any help would be great.

Rob