Rare Dodge Dart GT? Which engine is this?

The Fender Tag will tell you how the car was built, not what it is now. I'm sure there have been several mods done to it. If the car has not been taken apart, then there should be a "Broad Cast" sheet somewhere, that should give you more information than what the tag says. Look on top of the glove box or gas tank. Also under the bottom of the rear or front seats.