Found this good gear head ford website for you do-it yourselfers.
http://www.diyporting.com/
I found it looking into valve to piston issues and checking my head cc's
That's a pretty cool site - the stock 5L HO lower porting mirrored what I did to mine to try to make it good enough to keep up with the blower - good to know the flow in the worst runner does indeed get close to the best runner with good porting.