2200-2500 rpm stall is not slightly more than stock, 1200-1500 is. The bigger the cam you get, the worse gas milage you'll get. What kind of motor is this? Stock engines do not have enough compression to make enough cylinder pressure to keep a decent idle with the giant cams (less than 1500 rpms). I am going to build a 350 and I am going to use a Comp XE262H. It's the largest cam that will work with a stock converter and make enough vacuum to run power brakes. I will be using a 1200-1500 rpm converter with this cam and 9.5:1 compression.