69 DODGE DART HOW TO LEVEL THE REAR END

Do i vaguely remember that the factory springs had an extra leaf on the driver side for driver weight, but if you order superstock springs, the passenger side is actually higher to combat the torque of the engine?
I recall guys purposefully ordering two RH springs so the cars no longer leaned, and actually sat a touch higher on both sides. feel free to correct anything i'm misstating above :)