crankshaft question

From what I have read, with mopar small blocks you hit the HP limits of the block before you hit the HP limits of a cast crank.

As for the porosity comment;
Porosity in any kind of casting is something that needs to be managed and controlled but cast iron is one of the easier materials to cast. To have porosity that bridges the cross section of the crank that would allow oil to leak through to the pilot bushing hole had to have been as rare as hen's teeth. If it wasn't the mopar cast crank would have had a reputation of snapping off the fly wheel flange the first time you dropped the clutch not one of being as strong as brand x's forged cranks.