Single vs Dual Plane, big difference?

Yes!

But IMO, I do beileve you should go out and ether purchase or borrow a single plane intake and bolt it on after a month of a driving the dual intake that is super tuned. Then you'll understand why us old guys recomend what we do and how it applies to the combo stated/listed.

With the advent of the RPM intake (as well as Weiands excellent offerings) a single plane is hardly suggested any more for a street and street/strip car. UOP has run both intakes and the single plane slowed him down a little on his 11 second ride. Flyfish also runs a dual plane. On his stroker that runs ratherly well I might add. (OK, better then what I said, it's down right a nice and quick ride.)
70AAR (AKA Tony) also has a slew of low 11 second rides with a RPM.

While the single plane does look bad ***, it does lack the lower end torque that is used to not only get off the line but the mid range can be down a few pounds of to torque as well. Only a superior single plane intake can out HP a RPM. And if your not using that rpm range a lot, as in living in it for the race, then the intake is a looser.

Try both intakes and see as well as feel for yourself. Enjoy the experience and experiment!
This is how I cut my teeth on gaining knowledge 30 years ago. Trail and error. It lead to A LOT of parts on the shelf. LMAO!