In looking at rebuild kits for my Mercruiser 888, the kit I am looking at includes a new cam with the specs of 258/270 duration @ .381/.395 lift. My Clymer manual says the lobe lift should be .260-.278 when measured with a dial. What effect would this lift difference have? (No, i'm not doing the rebuild, but I'm curious. The rebuild will be done by someone who knows what they are doing)