As for pulling torque I'd go with Lunati's 60301 or 60302 cam. Very broad torque range but I'd recommend an 11" motorhome torque converter (built very stout usually painted grass green). Probably a hotter ignition system too. don't use a car performance cam because your torque will drop off rapidly below 3000-3500 RPM which is when you need it the most... At the end of the pull.