OOTB the newer head will be down on flow and power, but has a better chamber.
I would not run the new head without a good valve job and chamber cut. That's what we did and it makes the head MUCH better.
Bowl porting is usually around 200-400 dollars depending on who does it, but I know after porting these heads will be well over 300cfm at .500 lift. Ours went 286cfm at .500 AFTER valve job and chamber cut.
But.......remember the chamber of the newer head is better (after chamber cut and some porting)and would really lend itself to a pump gas engine needing a large quench area.

From what I see, if you compared the older head to the newer head FULLY PORTED the newer head will make more power. But OOTB...no way!