I have a virgin 6.0 iron block and I'm doing a turbo build I have a set of heads but ones cracked it can be welded but It started making me look into aftermarket heads here's the specs I haven't bought my pistons yet so my question is which cc heads would be better for boost to make 900 rwhp Casting ID Number: WOR-075

Material: 355-T6 alloy high density aluminum
Valve Seats: Intake (hardened), exhaust (hardened)
Valve Guides: Manganese bronze
Spring Seats: Machined for 1.560"
Valves: Manley stainless steel valves in assemblies
Valve Diameter: 2.080" intake, 1.600" exhaust (5/16" stem) as cast, 2.100" intake, 1.600" exhaust (5/16" stem) CNC ported
Rocker Arms: Stock LS1 with stock stands
Intake Runner: 235cc, standard port location
Exhaust Ports: 87cc, standard location
Combustion Chamber: 64cc or 72cc
Spark Plug: 14mm .750" reach gasket style, Accel P526S or equivalent
Valve Job: Multi-angle intake and radiused exhaust
Valve Cover Rail: Raised .300" for aftermarket valvetrain
Valve Angle: Stock 15°
Accessory Bolt Holes: Stock