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With a deck height of 9.500 inches, Dart's recommendation of a max 4.0 stroke and a max 4.185 bore would equal 440 cubes. With the right parts, you could get WAY more than 550hp with a hyd. cam.
I know a lot of guys with 418's with 550hp built by Eric H. @ Performance Engineering. He also builds a mean Dart block 427 stroker that's closer to 600hp (w/ hyd. cam). Also check with Keith Craft. He does the best head work in the business and can build you a high HP combo for a very decent price.
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