Not sure this intake will feed 600 hp

Brooks James said
Just saw: EQ has a set on new CH318A magnum heads drilled for the LA manifold bolt pattern that flow 227 CFM @.500 on intake
Under $900

Where did you find those?
I just rebuilt a set from Clearwater I think, be careful if they have longer valves than stock you'll run into much more than you want.
If they're stock valve length then that's good.
That's not a bad price.