Generation IV Internal Engine - best 6.0 steel production block

what are the best years for a 6.0 steel block cly. wall thickness ect i wand to build a boosted 4o8 just would like to get the best production 6.0 steel block .any better than others ? i need casting numbers thanks for any help roc

unless you plan on 6.xx in the quarter... dont worry about it...

I would say that perhaps the genIV 6.0 would be stronger than the genIII. I've had my gen3 bored .060 over.
Sonic tested checked out of course

Iron.....