I have a torker 2 intake on my 454 . The motor is around 425 h.p. , I am thinking about swapping the single plane for a R.P.M. or R.P.M. Air gap I really want more low end torque and I feel I,m not getting it with the single plane. I'm also going with a 3310 Holley. which of these manifold's are better? Not sure of the cam duration but it does have a slight lope to it , Thanks.