What camshaft spec for 425 hp

With your tire and gear your trap RPM will be around 5500 unless the converter is very inefficient. You don’t have much gear for that tire size. And that’s figuring you will be at 110 MPH, which is 12 oh’s if the chassis is very well sorted out. How do you know the converter will stall at 3500 when you haven’t chosen a cam? Cam timing (and how much torque it makes under stall speed) affects stall.