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As other people have said, the cams are your biggest bottleneck. Removing the flapper valves in the intake manifold will give you some small gains across the board as well. Xcessive manifold with velocity stacks next. Going to something with a bigger turbine might be a good idea, but not a necessity.
These engines are underrated because nobody builds them. Everyone wants to cheap out and do a KA-T on stock internals, then wonders why they die or don't make good power. Good luck with your setup!
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