In general most folks always opt for biggest port--highest flow numbers they can find and afford
That is exactly why AFR sells so many sets of ( chevy and ford )heads for about the highest price on the market Biggest valves--highest flow numbers
yet many engines that are built with them would be far better drivers and much more fun with smaller port runner volume
Folks always want a street car that runs like a dragster
They sell fake boobs but not man parts because guys would all have to push a wheel barrow to walk around
Head sales people know this simple fact and profit greatly from it

My conclusion is an easy to build cheapo 500CI big block with almost any head will make 570 HP easy as pie and be the most awesome fun most have ever had and often when combined with the right gear. converter/ intake/ carb combo out run many that sport much more HP and if it does not--WHO CARES? Because no matter how much HP you have or how much $$$ you throw at it thirty other guys can wax your behind so ??????????

If you want to go fast attend one of the dragster or funny car deals--pay a couple thou and on day two make a 200 MPH pass--then you are done for least amount possible