Which is probably the reason for it's pessimism. If you hit the port flow button after selecting that, you'll see those are some pretty lousy numbers. I would think stock Medium Riser heads would be much better, and infact the single number on the second website you gave me would confirm that. Measured at .600 the MR heads flowed 85 cfm more intake and 53 cfm more exhaust than the "Wedge / Stock Ports & Valves" setting. I'd think the Medium Riser would not be as good as the Edelbrock's though. BTW on the FE Big-Block Forum there was an interesting post of someone who did their own testing of the Edelbrock 6006 head and could not match the numbers that Edelbrock put out, kinda interesting.
http://www.network54.com/Forum/messa...geid=984787644
So I'm still on a quest for MR numbers but feel pretty good I'll have 400 HP anyway.
Thanks again, Chuck