It's true a 440 has more torque than a SB stroker. My 410 stroker with a mild cam .528 lift and [Email]232@.050[/Email] and 237 on the exhaust is a torque monster (500 ft lbs). Just advance the cam 4 degreees and it will pull that Charger just fine. You won't gain anything with a 400 BB. I've been driving and racing Mopars since 1961 (Yes, I'm an old fart). To install a BB you will need a trans, driveshaft mod, motor mounts and a radiator since a BB is longer. Ask yourself "Do I want more performance or am I joining the street racer crowd." A SB stroker will give you a nice ride. Patrick is a very knowlegeable guy. Ask him or Cab Burge.