Hot Rod did some manifold comparisons a few years ago. You might want to read up on their results and see how it might apply to your setup.
http://www.hotrod.com/techarticles/hrdp_0712_mopar_intake_manifold_comparo/index.html
http://www.hotrod.com/techarticles/hrdp_0801_mopar_intake_manifolds/index.html