Which head/combustion chamber is better for performance? Speed master aluminum LA or aftermarket magnum iron head?

Newbomb Turk said

None of those heads are for a max performance build.

You need to define your terms differently.

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There are some pretty nice magnum heads out there but the trouble is they came on Mopar crate engines or other sources and are no longer available. A friend has a set on his 408 based engine that runs 10.70’s. (2.05 valve). Edelbrock, Speedmaster, ProMax, TrickFlow, etc can be made to go a lot faster. But all require extra work. As did the magnum heads on my friends build. But like it says above more info is needed