la vs magnum

I wouldn't trust a stock 360 crank at much over 500hp. So right off the bat you are dropping a lot of coin on an LA or Magnum on the rotating assembly. Add in heads, adjustable rockers and shafts and already pushing 4000. That 6.1 hemi probably flows pretty Damn well stock. Is the rotating assembly strong enough for 650? Is a 5.7 a good enough staring point?