Hemi Dart and Barracuda info needed

Ok, so with what I found online, it look's like someone converted a 68 B body Hemi 4 speed into an A body 4 speed . The reason I'm coming up with that is the 8G on the VIN pad, 8=1968, and G= St. Louis, and all Hemi SS dart's, and barracuda's came out of Hamtramak , so that eliminates it.