Not a pro but everything I have read says single plane for FI. The Holley Street Dominator doesn't "look" like anything but consistently is a great performer. Check out the low deck intake battle from car craft or Hot Rod a few years back. It was pretty similar to the Edelbrock RPM giving up very little down low, outpulling on top and comparing very nicely to several, larger more modern intakes. And like you said, it will fit under the hood of anything.