How much hp/w2

I think the 640 ish number someone posted above is a pretty fair number for a W2 head and a single 4 cast intake.
I know of a W5 single 4 cast intake motor that made 700, and proved it at the track. That is the highwater mark i am aware of regards actual track results for either set of heads W2/ W5.
To me a dyno can say anything. But getting it on a track tells the real tale. Weight/ MPH