Just incase there is a misunderstanding here, we're tweaking our own work. The 346 heads are our's and our's alone. Hopefully there'll be some big changes once we start increasing the valve size.
I wish we were running a bigger cam right now, because this afternoon Cody pushed the 346 heads into the 280 cfm range @ .600" lift and 290 cfm range @ .700", with the stock 2.08" valves.