changes to that build i would make
1.eddy heads flow better out of the box than the stocks, almost as good as if you pay $1500 to get stock heads CNC ported. right out of the box.
2. use a GOOD set of roller rockers. go for HS or Jesel if you want to really hop it up.
Hughes at a minimum. i would not go with 440source setup
3. big block heads are cheaper to get flow out of than the small block heads. the int/exh ports are bigger, valves are bigger, etc.
4. bottom end absolutely go with forged crank, forged rods, forged pistons if you plan on 600 hp
