What Jody says is correct. They are a win-win in my book. Just make sure you get a good EFI system. I've tuned a bunch, even via email.
I did a 408 Chevy with the Hilborn setup on it. In fact it's on my video.
https://www.youtube.com/watch?v=RnSi6FgMXjE
Before that it had a dual quad tunnel ram on it with Brodix heads and a 260/
[email protected] Crane solid roller on a 106 lsa with .675 lift. It wouldn't idle at anything below 1100 and used a bunch of fuel.
After we installed the Hilborn intake it idled at 750 all day. The reason? No more dirty air. With the individual runners every hole gets clean air unlike a shared plenum like Jody mentioned. He was actually a little pissed because it idled so smoothly afterward. But with 10.25:1 and that big roller it didn't have any cylinder pressure down low, therefore no bang sound.
But even with that the throttle response was excellent. I'm a big fan of the IR stuff when done right. In fact I'm fabbing one for my Olds. Let us know what you end up with.