High CFM heads - What would you chose?

PRH said

So, the numbers from the local bench on the 4.030 bore..... don’t break 300?
(Hard to see what the number actually is)

I’m assuming you know why the first set of numbers from the 4.125 bore stop at .650 on the intake port.

Do you know if it’s the same pair of ports that got tested on both benches?

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Correct in the local bench. I believe the high number is 298 cfm. Quality and capabilities are not in question from the shop. There well established for decades with many years on the NASCAR & drag track backing there work. I’m also not bench racing flow benches. I completely understand this would be a bad thing to do. I did share results with the porter. Nether of us are disappointed or surprised really. There is a big difference in bore size going on here.

I will get a clearer picture this evening after work today.

Yes, you assume correctly.

I don’t know for sure on the tested ports.