David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

PRH said

Is the 1hp/ci supposed to happen with ex manifolds or headers?

If manifolds........ 318 manifolds?

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318 manifolds I believe, shouldn't be the worst restriction at 325 ish hp, there's a dyno manifold shootout on a 300 hp 5.9l and there 5 hp between 318 & 340 manifolds and 8-16 hp compared to headers.

Installing Exhaust Headers Into 300hp Crate Engine - Mopar Muscle Magazine