What power level?
I should have the 505" Stealth headed engine together and in the car in January (depending on work and family obligations and the weather) so I may have a better opinion then.
I am just running the Comp XR286HR-10 Hydraulic roller cam with ISKY 8005A springs and 1.7:1 rocker arms. Carb choice will be a big factor. Right now I am going to use a Holley ultra 770 cfm street avenger (largest ultra holley carb with electric choke), but may go FI in the future.
Using consertive head flow numbers (266 cfm @ 0.600") in the Dynomation software is showing 540 HP @ 5,200 RPM and 618 ft/lbs @ 4,200 RPM.
Changing to better flowing heads (291@0.600") only shows an increase of 20 HP and 20 ft/lbs.
So it looks like my small cam and carb may be more of a limiting factor than the heads?
On the simulation, just changing to an 900 cfm carb jumped power almost as much as the ported heads.