I have heard that the industrial blocks can be over-bored significantly.

I have seen more than a few Max Wedge stock eliminator guys run the industrial block in their cars.

Also, I have heard that the original 413-426 max wedge engines were built using the tougher industrial blocks, iron rockers, connecting rods, ect.
Don't know if that is the case, but if so it would make sense from the accounting office's perspective...build a race package mostly from existing parts.