318 MAX fuel economy builds?

mgoblue9798 said

Just my two cents, but I would just hit the easy button and run a set of magnum heads. Closed chamber, port velocity, hardened seats, and flow is already baked in for what you are trying to do. Have a good valve job done and run them.

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My thought here is the Mag ports are 360 size and my manifold is 318 size Edelbrock performer. I don't want to run the larger intake manifolds as I want to keep the velocity in the manifold high but not restrictive. Are the factory rockers on the Magnum engines adjustible?