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I agree that the newer chambers with the added material between the valves should be "better", but it doesn't seem to make much difference in the "big number" on these things....... At least with what I'm doing.
If you're looking for 360-370, it might be more of a player.
Get the short turn right, pinch opened up enough, bowl/guide boss area sized right, clean up the rest of the port...... Mid-350's@.700+ are usually the norm at MW size.
Yes, not a cost prohibitive/ chase every cfm available effort. But definitely a major bang for the buck.
