I've never heard of anyone doing this, but here are the three cranks available from the factory.
Olds small block (330-403) 3.39"
Olds big block (early400-425) 3.98
Olds big block (late400-455) 4.25
I'm guessing the 425 crank (3.98) would fit in the 350 making it slightly smaller than 400 but I don't know what sort of deck height problems you might run into.
Just for giggles, here are bore & stroke numbers for Olds:
260ci 3.50X3.39
330ci 3.94X3.39
350ci 4.06X3.39
403ci 4.35X3.39
400ci 4.00X3.98
425ci 4.13X3.98
400ci 3.87X4.25
455ci 4.13X4.25
Hope this helps!
Shiny Side Up!
Bill
'72 442 "Inamorata"
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