Carb metered and made more power with the spacer because the fuel charge was BOTH "more even" to all of the cylinders but also because the proper amount of air was able to to the intake runner requesting it in the time allowed.
EFI systems like large plenum volumes to the runners.
Look at a Marcella manifold or a Hogan manifold. LARGE PLENUM AREAS
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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