Is the 383 a better engine, or does the 440 just have more displacement?

CNC-Dude said
Probably the single largest gain in performance by comparing the 451 B block build vs. the 451 RB build is in the blocks themselves. The weight loss from the B block alone compared to the RB block is pretty significant.
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According to this article by Andyf, there doesn't seem to be much difference in weight. Sonic Checking the Mopar Big Block | AR Engineering