If the Idle Is higher then what you had for a Stock cam YOU Will need a Losser Stall speed. And as to adjusting the Valves Do what the NEW CAM CARD Calls FOR. If this is a Mech. Esp. a Hyd cam will still remain at Zero Lash. If the Stall speed is to LOW and NOT what it should be for a certain Cams ProFile It will do one of two things It's either going to Stall the Motor OR It will sit there and Jerk The dog out of it Because It's going to want to PUSH the car Just Like doing a Brake tork.