No matter which Mfg you choose to supply your cam, CALL THEM and ask for a recommendation. Unless you are a professional engine builder and KNOW the complete combination of parts that will be used,,, you will probably choose the WRONG cam! Most of them have toll free numbers and will be more than willing to help. There are some software programs out that get it pretty close but why pay for what you can get for free. Almost every customer I had that picked their own cam chose one that was too big!! Bruce Hevner