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Can't help with all the questions but...
The 400 is a BB and your 350 is a SB.
This will mean you'll have to turn down the main journals
of the 400 crank .5" in order for it to even fit in the 350.
As far as it actually rotating?
No idea if you'd have to notch the block.
You'd probably have to get custom rods & pistons as well.
(this isn't a swap I've ever heard of, although I bet some one here
has tried it!)
However, people do put 425 cranks in the DX(diesel) 350's.
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