There isn’t one. Not one. If you have ported very long one of the first things you learn is flow isn’t everything.
The second thing you learn is ALL these engines are under valved and under headed.
The third thing you learn is shape and size are far more critical than flow.
To that end you learn swirl is what the OE’s stew over to get the cats lit. For performance and horsepower you do your best to reduce swirl because swirl kills power.
Then you learn that most of what is said in magazines, on the internet and on forums is 100% BULLSHIT.
There is not a single advantage to a 302 head. Ever.