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I would go with the ET Performance 5.3L head. It's very reasonably priced, and it flows a ton of air. These heads have made over 460RWHP numerous times.
If your budget will allow it, go with the AFR 205's. I spent a few months deciding on what heads to go with, and Im glad I chose the AFR's. If you do a lot of research on here, you will see that they are worth it.