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There are still bigger than 6xx inch motors. Pat Musi and his guys (among others) build 707+ big blocks.
Regarding the 400, most of what I know has been said- they have siamesed cylinders so they run hot, they won't take much of an overbore, 2 bolt blocks are stronger than 4 bolts.
If you can, get a 509 or 511 block over an 817. Not that there is anything really wrong with the 817 but they are more failure prone.
400s are also externally balanced.
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