This '63 Impala got a complete overhaul.  We put in a brand new GM Crate LS with 376 Horsepower and 480 ft/lbs of torque and a GM PCM Controller and CompuShift trans controller. It got a whole new fuel system with a Aeromotive fuel tank and in-tank pump. We also put in a Billet 2800 stall converter and billet aluminum drive shaft and  mounted the battery in the trunk. We then rebuilt the  differential, added 373 gears, Eaton posi and new axels. The build finished up with custom fuel calibration and tune on our chassis dyno.