All of your responses make me more optimistic. I am just surprised these heads are that capable without going too crazy. I’m guessing it’s the excellent mid lift numbers that help this head to perform?!
I've run a half dozen or so 270 head combos on the dyno and they have all made more than 700 hp. Some of them with less compression and a smaller cam than what you are using. If everything else is equal in your build then I'd expect 720 hp from what you have but it always depends on the details. The carb has to be right on as does the timing and the plugs and lots of other little details.
