dual plane vs single plane?

single planes have longer runner length,if you go by the point where the dual plane port runs into another one-[have a look on the bottom of manifold] 440 are bloody grunters , 1 reason is their intake runner length ,so you can get
more grunt out of a single plane iff the runners aren't too big ,as well as hp.
hot rod magazine did a test on a stock clevo and dynoed it then fitted a
single plane with reasonable runners [slightly big] and produced the same torque at 2400 rpm as dual plane and 60 hp.more on top, also as duster don said the performer rpm is also a good choice,iff you have wheelspin problems
with the torque you've got then putting a large runner single plane will kill a bit of torque at lower revs and give you more hp. up top and the faster you are going [as you build up revs] the less likely you are to break traction-ken