They used what they had. Could have, would have, makes no sense. What they have now, makes sense.Ok. So why start with a head that has small valves and ports?
They could have used a 360 head, spent the money for a GOOD valve job and then spent an hour fluffing and buffing the head and then send it.
Charlie has how many tests on those heads? I guarantee you Charlie isn’t charging them for the work. Or at least not the full bore rate.
I don’t get the waste of time and money to try and prove you can buff a turd.