I certainly don't want to take any business away from Keith, but here's pictures & info on the Blue Thunder heads. You can use either HR stands, have them milled to accept MR stands, or use individual studs for each valve ala 351-C, although I don't know why anyone would want to:
http://www.garrettmachine.com/cylind...er_fe_alum.htm
Keith, I sent you another email concerning edelbrocks vs blue thunders...would you rather I posted my questions on this board? I've done some more research on my DD 2003 and found more hp in larger cfm heads than my latest e-mail to you. I had to drop my compression for standard fuel, then tried a higher-flowing head to get the hp back, and it worked with minimal losses at the low end. I'm still talking about a .650 lift mechanical roller, and hp peak comes in around 6000. Duration @ .050 is 242/248 and it seems to want 380 cfm @ .700. This is for a 496.
Thanks,
Dan Kirsch