what single plane manifold for 360 magnum?

Hey all
I have a 360 magnum with a vortech supercharger set up.
I currently have edelbrock heads and duel plane intake.
I have one plug showing its a bit leaner than all the others so I was thinking of installing a single plane manifold. I like to keep all my parts the same for better match up if possible but it looks like edelbrock don't do a single plane for the magnum. I can only ffind a Mopar Performance one. Can anyone tell me what single plane manifolds are available for the 360 magnums? and has anyone used the mopar performance ones?
Is there going to be any negatives to swapping to the single plane
cheers Maca