Hi, I'm planning on building either a 489 or 496 depending on if my Gen V .030 block needs bored. What rotating assembly should I use, Scat, Eagle or Callis Compstar? Hoping to get close to 600hp.

I'd go with Scat stuff. Everyone I know that used their stuff is very happy with it. Tolerances within spec, etc. Eagle stuff is good, but often the tolerances are not in spec. As for callies compstar stuff, I dont know. But callies magnum cranks are really good quality. I would like to think their compstar stuff is good quality as well.