You are right not a Polara 440 but the only difference would be trim level right? The sheet metal would be the same between Dodge 440 and a Polara. The Dart sheet metal is nothing like the Polara and Dodge 440. I had a 1964 440 Polara so I assumed in 63 a 440 Dodge would also be a Polara. I learned some new about the early Dodges. Jayson