Magnum vs LA compatibility

It didn't crack because of power.
Right. My question now is: since I plan on making some decent power (around 550-600 hp), what’s the N.A. limit on an LA block? I’ve heard from people that the magnum blocks have better castings, more accurate machining, etc.. There are future plans on a Paxton supercharger. So I’m trying to figure out what will be the best for longevity and durability.