Dana sold the 273 many years ago. He put the 380 hp 360 in it about 15 years ago. I don't think he's driven it at all.
Going to leave the 360 in it. I can buy the engine that came with my first D/Dart but the seller wants way too much money for it. Besides, it's frozen up and missing the carb and air cleaner. The 360 should do the trick.