And it does seem like sometimes if the crank isn't finished for the bearing that it also isn't drill deep enough. But it's more of a feeling than a definite memory. :)
this is very much true for LA engines in that some cranks are drilled for the 4spd input and some are not-- a mistake of not checking you'll only make once...
i don't know if they changed that and all the magnum engines are drilled, but i've yet to find one that wasn't.