The 440-2 with a Dominator made more power (and costs a lot less) than the Indy X ram on my motor. Fast68 did some dyno testing where the X ram made more power than a 440-2 (or 440-3) intake. So I'd say the two are close in power but the single 4bbl will cost a lot less and be easier to dial in.

However, the x ram with dual carbs does have a big wow factor so that is cool.