IIIRC there was a flow test published years ago, in some Chrysler magazine, where someone and it may have been Dvorak, flow tested a bunch of heads, then put a set of stock Hemi heads on the flowbench just for fun. I seem to remember the stock Hemi head flowing around 305cfm on the intake port, which should be good for 600 - 630 hp. R.
Either you are not remembering correctly, there was something wrong with the flow bench or there was something was wrong with that head. Stock heads with a good valve job should top out at 330-350 CFM. The heads on my car currently are unported factory iron heads from 1968 and on a 12:1 compression, roller cam 426 engine it was running mid to low 9's. Dvorak went through my heads prior to bolting them back on. This site has some head flow data for various heads including hemis http://www.mopar1.us/flow2.html
