340 vs. 440? (Help)

From experience there is nothing like a 440 A body (M code '69 Dart) for right foot giggle factor. Having said that, the only way I would have another one would be with an aluminum block. They are nose heavy pigs with cast iron blocks and to get enough spring rate to make them turn they ride worse than oxcarts. Traded my '69 Dart for a '70 Swinger and never regretted it.