For MAX TQ you want a small duration cam. I use a Crower cam #32243 that can be used with STOCK rockers/pushrods and STOCK converter and 323/355 gears. My 71 Charger R/T runs well inmto the 12s with this cam, thermoquad, holley street dominator intake, TTI Headers and 355 rear and stock 11.75 converter and drag radials. The car has unreal TQ that moves my 4000lb + car like you will not believe and the idle and drivability of my car is like stock. A combo like this in a lighter car like a Challenger should run low to mid 12s easily.