Engine Combo's that turned out terrible?

Take a 440 six pak engine with a .509 MP cam out of a well running 70 Charger R/T with a 4 speed and 4.10 gears and drop it in a 72 charger with an automatic (stock converter) and 2.76 gears and wonder why it won't get out of its own way.I learned about cam selection/torque converters/and gearing very quickly.1985 when I was 20 years old.