Dyno'd my Duster 340 how did I do?

Hello,
Great setup. It's similar to my current project. 1980 Volare, 360, Comp Cams XE262 cam, SpeedPro H116CP pistons, 596 heads topped off with a TQ carb and a 727 transmission with 2800 stall with 3.21 sure grip.
However, I'm caught in a dilemna. According to guys I've spoken to at swap meets, my intake manifold choice, an Edelbrock Performer, will not make the power I'm expecting. Having said that, I also have available a stock cast iron 1970 340 intake manifold, and a Weiand 8007. I've been told the stock cast iron 340 intake manifold will outflow them all. Any opinion will help with these final steps to completing my project.