O.K., if you're changing the gear, then you can use a little more cam. Usually the first one that is listed from any particular manufacturer is the best one to use in your first build, particularly if you aren't going to change the compression ratio of the motor. As cam grinds get wilder, the intake closing point is moved out further and further, so you need additional compression ratio to make it work. Choose the first cam on the list and you'll be fine with an otherwise fairly stock motor.

All the cam grinders offer a service for you. Just call them up and talk to a tech about the right cam for you. That way, you have the recommendation of the experts who are going to grind the cam.