Yeah it's confusing, I have 2 builds, the VS cam I finished witch is the engine pictured on my 40th anniversary gp and a XPZ build on the GTX pictured two cars two builds. One mild the other a big one. I am running a new stock damp and chain will that be good enough? I do have a double roller as well as plate for it. All these parts I have so its just a matter of installing. Just more of is it worth the work vs gain. As I said I just want to keep up with muscle cars mainly srt8. That is all.