Thanks for sharing the video.

That dual quad looks cool however, I think I am building an engine that will likely demand more than that manifold can provide. The previous post where it was mentioned this manifold causes lean cylinders sure got my attention. I am leaning towards the Prefix Cascar manifold but have not ruled out the Indy Modman either.

Yes, I read Tay and Ric's comments with great interest. All aftermarket intake manifolds have their drawbacks, the Factory knows exactly what they are doing. The active intakes on the new Hemis are Engineering Genius that work.

The dyno torque curve doesn't lie on the Edelbrock and the long runner factory intakes. Unless you plan plenty of trips over 6000 rpm, for carburetor application, the Edelbrock is better. HP per ci you would be setting at 590 and 570 (single vs Edelbrock) at 426 ci.

For 20hp at the top end difference, I'd take the 20 to 50 lb/ft bottom-end torque all day long over the single planes. And, in my experience, if there's one thing a Gen 3 Hemi needs help, it's in the Torque Department.

Just opinion, but with those W2's, I'd be looking at a 4.25" stroke upgrade to what you have now. You're probably 550hp now, turn it into a 438 and you should be 600 to 680 capable hp. The Gen 3 will do it, but what is this going to cost you?