getting cam directly from Comp. lock it all out. I have new chrome moly push rods as well. call them talk to tech tell them what you are looking to do and they will guide you thru the water. if not ask pointed questions on here, the support on this site and over on moparts is awesome. if you can do it use the manifolds 408 swinger mentioned previously, unless you want to give tti $800 plus bucks for new headers like i did. but i wanted long tubes, so that was my choice. The support is awesome here.