That manifold is a horrible design. Those on JBO showed huge losses in power when they switched to it... that's why that manifold is so rare, it was a poor concept.
Primaries like that belong on an exhaust, not an intake.
Also your ports won't line up with that manifold, you'd need to weld on a new flange or adapter, and have a custom gasket made like I did for my custom manifold.
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